The more I play, the more suggestions I have, so I'll put them all into one thread!
Gang System
This goes for both Classic and Era. I'd love a better Rank system. I remember playing one iPhone game in particular which had a great clan system called Celtic Heros for the iPhone. My first Suggestion is to give you the option to change the original rank when a player joins. Every time I recruit somebody, I have to stop and make their rank nothing, even while I'm defending a base. This really messes things up. That should definitely be fixed. You should have the ability to change the original rank. Next, there should be a better system with ranks. I'd love being able to pre-set the ranks, and just have a rank-up or rank-down button. Next, I'll add Monkeys idea of having a button after the kick button to allow people to enter guild houses in your gang. That would be great.