i agree and the new demigod part i can wait like you said the other points are just more important

In a game like demigod having a bot replace a player is worse than simply having that character vanish from the game.  Bots feed like nuts.

You can see what demi's people have chosen, its the same place as where you choose your on their line.  Unless your talking schemish in which case you never enter the lobby so that point is non existant.  Otherwise I agree.

I think when we see more 5v5 games, people will tend to stay more.  right now, with just 2v2, there's very little incentive to stay.

I was of course referring to Skirmish and pantheon games, as i find these the most meningful to play.

About the leavers, I would go further. It think it would be a strong, but useful punishment if the leaver lost his currently equipped favor item (it is really annoying if an enemy leaves, and more annoying if your teammate left you in trouble). If he DC then nothing, or maybe -5%  or -10% favorpoints.

Or maybe a vote about punishment. The players who left in decide.

Also the leaver's DG should not be controlled by AI, just stand still or even removed from the game, may left behind their items.

I agree with most of your points.  However, there are two I do not.

First, I don't feel that Demigod needs more characters.  Although that 8 is a very small number for this type of game in comparison to others (some dota clones boast some 20 odd unbalanced characters), I feel that adding four demigods would simply cause there to be four demigods that never get played.  Honestly there is a demigod for every major playing style already.  If four more came out, they would either replace others in their own niches, or would try to be combinations of other characters.  Inevitably, people would initially whine about how the new characters are either over- or under-powered, and patches would either nerf or overbuff them.  If the new characters were combinations of the others, it would lead to games where everyone plays them, or they get owned by the characters that focus on specific areas.  Then you would have rooms that ban new or old characters... yeah.  Eventually you'd probably get Might and Magic Syndrome (having too many playable races/characters/units that are repetitive and unused), and people will start posting unofficial pre-patch servers that all the really good players spend their time on.  Then you'd end up with official servers being full of noobs and whiners that don't know how to get to the unofficial servers.  I'll leave this point with two more words.  Planetside Aftershock.

Second, I'm not sure I'm clear on your Item Combinations/Upgrades.  Do you mean being able to fuse two items into a single slot, or adding a gem or something to add another stat on your item?  I think you'd simply end up with the same cookiecutter characters, but they'd take longer to get in game because of the sheer amount of gold involved in getting the best weapons and equipping them with the best upgrades.  However, I think some new items might be cool.  I find that some items aren't specific enough.  For example, an item that gives good hero stats and oh by the way bonuses to your units is a waist of money or item stats for an assassin.  Perhaps having seperate assassin/general shops would be interesting.  Also, trees if items with similar abilities instead of the more general item trees that currently exist might be helpful.  For example, maybe you've got a character that really needs mana regen because you've only got 10, but you've got only one item slot.  You don't get a high end item, because most of those give % bonuses, you have to get a lower end item.  Sad day.  It's like wanting to buy a lowrider, but having to get something with like four to six inches clearance and rock hard suspension because of the new monsterious speedbump they just put into your neighborhood (true story).

Also, on that note, I agree with angryandroid.  They should get balanced before adding more.  Some items are totally useless at their cost, which is sad.

What do you think?

I strongly disagree with this. That would be too harsh of a punishment when some people may leave for legitimate reasons: Family emergency, wife aggro, house on fire, ISP goes down, and so on.

I like the OP's suggestion on this where there is incentive to stay but not punishment when you leave.

This

ROFL !! Wife aggro!! That made my day

Maybe it is too strong to punish like that, i feel that. That is why i wrote, there could be a vote. And you can tell the reason before quit. Today i had a game when in the start 2 of my teamates left, I had to face against 3 player,  i knew i will lost the game, but didnt quited.
Also am I the onlyone when i start play i make sure nothing will interrupt? Or if it is really important i dont care my favor item, it is just a game, and i can get it back in a short time.

( I dont like leavers, sorry  )

And yeah, I love the idea of Winning if no Player left in the enemy team.

I have little intention of picking apart every point you made because most of them are very reasonable, but this one sparked my interest.

Yes, it is a great idea to have the ability to combine items, it would have improved the gameplay greatly as the items are the basis for scaling during the progression of the game and having such options will expand on the gameplay during the longer matches. Although, I would guess that this exact suggestion would have been mentioned 7,000 times during all phases of the beta testing and ignored every time. From the general feeling myself and other testers got is that this idea will make the game feel like it's trying to copy DotA too much, and the developers do not want to copy DotA. So unfortunately, there is a high chance that this will not be implemented as the developers were aware of this from the beginning of the game's development and throughout 6+ months of beta tester's suggestions and feedback.