Something this game needs badly. Right now, if you want to do a mission with a group of players, you have to go through a process somewhat akin to a cattle market. A simple system where a player can set a lfg flag, and an interface for browsing all those lfg in your district and select for grouping, is sorely needed.
As it is, I've given up on player groups and am sticking to henchmen. It takes too long to set a group up and the results are too unpredictable.