I don't have the computer hacking skills that some of the modders and programmers in this community that have created all the mods for this game, so I don't know if this is even possible... but could there be a mod where you could take over control of a Demigod for an AI team mate? And then be able to switch back to your own?
I imagine the effort might be considerable, more so than would be reasonable to ask from the people who've already been too generous with their spare time to try and make this game better. Or it might just be impossible to do with just a mod, something that would have to be patched into the game itself... and yeah, no need to get into the willingness of GPG to do that.
It would be unbelievably great for this game if this was possible. To those who haven't played with the latest versions of the skirmish AI, its incredible what they've done. The AI captures the right flags, buys the right upgrades at the right times, buys the right items, they chase when they should chase, run when they should run... etc etc... Of course, if you could actually take over control of an AI demigod on your team, we'd want to change the programming of the Skirmish Mod so that you could pick the skills and make all the purchases on your own.
If you could take over an AI when you needed to, it would be a whole new way of playing Demigod. You could play 3v3 tournaments on cataract with one person taking turns controlling the 3 demigods on his team. 4v4 with only 2 players on each side...
Well, no point in going on and on about how awesome something is, that is probably impossible.