Here's an idea

What about allowing guilds to choose (and customize) a flag. Then ontop of guild HQ's their flags will show.. and ontop of towers their flags will be flying high..

Also, when you build your controller u should get an huge banner that some1 can carry. when they are carrying it then get an evade, ac, run buff and damage... however when they die the controler loses say 10% - 25% of its HP.

so this person would probably be some1 like Solder, Enforcer NT - some1 with already high damage output.. so then rest of guild would protect this person... who would be doin amazing damage.. but if they die... the controller becomes vulnerable.

Its just a thought.. The flag should go in a utils or hud slot..