i'd certainly agree with more gametypes, but certainly not reducing the speed. It's about as slow as it should get right now. I'd actually say make it faster. You can still have just as much tactical gameplay along side fast gameplay, which ultimately makes for a better game (unless you like RPGs, i can see how you'd want it slower).
problem with bigger maps is the server support sucks. 32p servers lag like none other, and you'd need that many players for larger maps.
+, cant really call your "version" more "realistic"... to me, the current state of the game is "realistic", so it's just a matter of opinion. Well, we could go ultra realistic in which the aeros basically rape everything, because that's basically how real wars are.