It would be cool if spy and robbery attempts directed against you by other players were recorded in the list of available supporter information. That way you could go back and see all of the spy attempts and robberies against you easily. This would obviously have no direct effect on the game but it would help you keep track of pending vendettas .
Another idea I had for a Supporter Perk is the ability to buy multiple items from the Black Market at once. i.e. Instead of a confirm option when you click BUY, you get first and option to enter the amount you want, then complete the sale by confirming. Something small, but I know I'd find it extremely useful.
or you can just hut f5 after buying and item like 4 times straight if you need for 4 more of the same items .. works for setting crimes up too .. like if you going to do a 1 turn crime with the same setup 7 times then just keep refreshing till you out of turns little tip I picked up from Crus from the previous forum