I don't know that I would stress the leadership aspect too much. I would look at making a list of 'crew' MARs to replicate some of that and then work with the existing upgrades to create a list of possible refits? Along that same vein, as your Admiral gains renown instead of gaining leadership he could gain bonuses like extra TACs for free, fleet wide bonuses for command checks (heh, leadership), and rerolls (something most BFG fleets got also).