Hmm, I do already have a no-bases mode (called Survival) and it works pretty well. Each player will have a "leader" unit - the Chrono Ultima Tank, Doomsday Devastator Tank and the Floating Fotress - and if short game is turned on, when that unit gets destroyed, that player loses.
Airwar mode definately won't play well... and "protect the civilian mode" would require it's own set of maps to work (like Assault).
Littlebry, some of those ideas sound interesting. I'm not too keen on having a "certain tech level ONLY" mode at the moment - I don't think it would work too well in this mod. I already have a "mega speed" mode. Clear mind mode would be unfair to Yuri... and I don't think a "no navy" mode would be played much (it doesn't really change enough things to warrant it being a proper game mode). That Nuked mode - where basically everything is nuclear - could be fun I suppose, once in a while. I'll consider implementing it.
I did say that I was scrapping Heavy Metal mode - but I could just change it instead. The original idea would require all sides to have the same things to be truly balanced...
the original idea was to basically have only conventional tanks available. Probably no aircraft or even infantry. By "conventional", I mean the Grizzly, Rhino, Lasher, Railtank, Reaper, Floating Fortress, Mirage, Prism Tank, Apocalypse, Doomsday Devastator, Annihilator... and others that I can't think of right now. Just basic, nothing-fancy tanks. No chrono tanks or mind control or anything weird. Having such tanks would give a disadvantage to Yuri (and somewhat the Allies), so I planned on making the same units available to all sides. This was the original idea for Heavy Metal mode. yay or nay?
The idea that I scrapped was basically having a "low tech mode", where you could only build up to, say, the Battle Lab level, and probably have no infatry or aircraft.
Aside from these ideas, I have thought up a pretty interesting one myself. Anyone who has played Age of Empires and knows what a "Wonder" does will have an idea of what this is.
It's a mode where, basically, it's a race to construct some important structure. This structure of course will not be easy to contruct. It will cost a fortune and while you are building it, someone could destroy the prerequisites to it, meaning that you have to start over. When built, either A: you will deploy the building to destroy everything on the map (except the actual structure itself), or B: a countdown timer will start, and when it gets to zero, you can fire a weapon that is so incredibly destructive that it clears the map (apart from the structure itself). So, the first player to own this building for long enough to fire the weapon, wins the game.
This mode could work...but if I went for the countdown timer method, I'd have to replace a superweapon... which superweapon could we do without? I can't replace the Force Shield (it will mess up other mod aspects) so it's either paradrops, or high-level supers. Heck, I could actually make the high-level supers (Weather Controller etc.) the structure to build to win. All that's needed is a cost change, some major upgrade in power (so that you win instantly when you use the superweapon), and a few other tweaks.
Sound good? If so, consider this mode (which I'll call "Domination" for now) implemented.