In my opinion.....
Ye, I think this could be a good idea but only if it wasnt abused and turned into a DM
It would be good if it were RPed so like... The Montana's stole a load of drugs from the ship which the Ancelottis were waiting for and so they all got angry and so a fight has been organised to settle this on 25th April at 20:00CET.... (in the events section of the forum)
It should be like once you die, you cant re-join, must be supervized by an admin, The guns could be pre chosen (maybe), each gang has its own skin, any gang wars not pre organised are against argonath rules.
It would be like an event but that would mean that it wouldnt be abuse and, events are fun!
I think the SFS TAC war was uncontrolled, just a constant battle between SFS, TAC and the cops and had no RP behind it which wasnt great for Argonath