After using the search function I havent found anyone yet, who had the same idea.
Do you remember Assault in UT? Team A must assault the base of team B in a timelimit. When it's done, Team A must defend the base as long as the first limit was.
I think it's a great idea for GTA3 in multiplayer
I give just an example:
Base:
The skysraper, wich you can go upstairs (uh, english? )
Its the 11 in this map:
Here's a cutout of the 'base':
I think thats a good place for that. If team A wants to take the base, they must take 2-3 checkpoins (for example a cycle where a member of the team must get in to get the checkpoint), wich can't be taken anymore by team B.
A team has >=5 members
And weapons... Mhh... I don't know exactly now...
As base you can take the airport or a subway station or something else too.
What do you think about that?