GANG BOSS feature is already implemented..
Really like Formidable's ideas (maybe with the exception of an 11th gang member as a potential prize, could make things really unbalanced). Maybe if there were a limit to who got 'locked' onto the boss or assignment it should be 5, to encourage more gangs to get the full 10 members online at the same time. Obviously you could pull it off with less, but like war, it would be a lot tougher.
ya black market
This is the best idea Ive seen in months!
I will re-iterate my proposal of gang missions here, since I think it's pretty much the same thing.
The BOSS and RIGHT HAND of a gang, can start GANG MISSIONS. When started, the gang is tasked with defeating a boss AND completing an assignment, both within the same time limit. When a gang member begins either fighting the boss or doing the assignment, that gang member is locked into that particular task for the duration of the gang mission. For example, if a gang member starts fighting the boss, he/she cannot help on the assignment until the boss is dead.
There should be a limit of how many people can join either the assignment or the boss (a max of 3-4, perhaps, depending on the mission, of course.)
Of course, each of these things can be broken into phases, which get harder and harder, and might require more or less people getting involved ;)
Some rewards I just came up with out of the blue:
//Formidable - DeathWish MGS