Problem isnt just getting teams together, its the fact we need gm to both transport to armory area and to start actual 5v5. If you could make NPC spawn teams of 5 to armory area, then only require gm for startying actual fight, it would be a lot smoother. That way teams can get themselves ready, and gm only called when 2 teams are equipped and ready to fight.
also there should be some kind of rule about changing your roster. Otherwise there actually isnt even a point in registering a team, everyone will look like this:
SOT will join but looks like each day will play different people.
1)***
2)***
3)***
4)***
5)***
Will be updated later.... 
So basically no point in even registering team right now