I usually dont give ideas to other people  but...
First of all i would like to recommend to change the way the influence operates. Personaly its hard to believe that humans can in any way influence lets say drengin ... since we are .. you know.. different. no drengin will like human. thats a little to impossible. lets change the system and let the influence work only on minors. Minors as they are now are not interesting.They tend to be only the money source, nothing else. they usually become a prey in the game. But if influence workes only on them and you have enough enfluence, you could command them to attack perhaps those drengins. they would be like little pests that make other major civilizations life a lot more of a problem. imagine one civilization (than you hate) getting attacked by all other minors. A big problem right. so there will be all out war to dominate on minors ( and not just attack them) and in this way they become serious tool in expirienced players hands. 
it shall make the game a lot more of a fun. 
Second, i would like to see the minors form something of an alliance to defend themselves. they sould be smart in thinking the ways to defend themselves agains others.
There are other ideas too in development.
Thank you