Orsm mentioned this idea in chat, I think. If I've got it wrong, correct me on it, but I think the idea was something like this, with a little fleshing out by me and born2ahck in chat at the time:
Give each district a bonus for the gang that holds it. Put a limit on the number of districts a gang can hold at one time, like no more than two at once.
District 1 - 10% boost to Hard Drive
District 2 - 10% boost to CPU
District 3 - 10% boost to BUS
District 4 - 10% boost to RAM
District 5 - 10% boost to cash gained from hacks
District 6 - 10% boost to Firewall
District 7 - 10% boost to Hacking Skill
District 8 - 10% boost to experience gained from hacks
District 9 - 3% boost to HDD, BUS, CPU, and RAM
Seeing as the suggestion forum is locked, I thought I'd see if anyone else had any helpful ideas for it, too