Ever since my first XCOM multiplayer game I've thought - Wouldn't multiplayer be so much more fun if there was no unit limit or 16/ 24 units per team instead of just 8. I think the main part of the mod would be tweaking the Edit Loadout UI.
It would also allow for small squads of XCOM soldiers vs numerous aliens.
Also, perhaps units could spawn in waves?
I'll consider making this mod myself. I'm curious if it's possible to make mods like this without Hex editing?