which then would be what exactly?

As much control as DG gives for modding, I would be amazed if it was not possible. However, I do think it would be a fairly large mod. Currently, the modders are just starting to figure some of the more basic stuff out, so something like this would be a fair ways down the line.

You'd need a map with 3-10 lanes converging in a central point. You couldn't have demigods starting in each other's bases and the like. Would be a tough mod indeed.

Or use a different game type for FFA mode. Something like King of the Hill, or CTF.

He'd have to have some sort of stun immunity. Either he halves the duration of all stuns or he can't be stunned more than once in a 10 second period.

I /might/ think on working on somethign like this: it really just depends how modular the game is and how much free time I feel like wasting ~~~ I really don't like lua though :-/

If someone wanted to do a Xv1 mode then we'd have to figure out how we would make it up.

Does he start with a Warscore bonus (WS 4 + first two levels of both tower upgrades + Death + XP 1 & II & Currency)? Or would he simply accrue Warscore much faster than everyone else?

Would his items be cheaper/he starts with more gold? Or would he simply just start with a large level advantage or increased stats?

What about abilities?

What about his minions? Would he get something like free super-Yetis that he could control? To help contest other lanes?

Also, would this be built for Prison, or Cataract? I think it'd be best if we built this with a specific map in mind and balanced everything to THAT.

Also, would it be a Slaughter match? the "God" needs X kills and the "Demigod" teams needs Y kills? Or a typical Conquest.

Towers? How  would we deal with those? Also, monks. Could we make the God be able to purchase idols too so that Unclean Beast could be a more viable God?

Balance would be a hard thing to figure out though. I think it's preferable it would be balanced in favor of the God, but we could always over do it :-/

On another note:

There is also a capture-the-flag mode implemented in the game, it is just commented out. Though with Erebus and DA I think it would be a bit obscene.

Actually, you could do this on the big circle map.  Modify the map like they did with CAT and remove all towers and citadels and flags.  Have one flag in the middle ring and have it be a 4 player map max.  Then, this would be the hard part, if you can make 4 'teams' have it be a domination game and you put 4 crystals HEAVILY surrounded by towers with 2 portals on the inner ring that are owned by the flag owner.  I have no idea how to even begin modding that but that would make it possible now on a current map.

It would only be one map, but it would be COOL!!!

I think the major challenges will be:

1- Change the dynamic from 2 to 4 teams (one for each demi)

2- Make 4 different spawn points

3- Make the map modifications to remove everything and redesign it to suit these needs.

The rest should take care of itself, the domination game type should take care of the winner of a 'hold the flag' type game and conceivably you could also do one of those first to 10 kills type games with this setup.  

Very interesting idea!