Don't know if this have been suggested before but many many times I have thrown these criminals in jail without realizing that the staff have already been put in jail some where else..

So the JailBreak screen that appears when you go to Manage>Spend that shows you the current Jail situation for each city should also be on the Jail breaking screen when I go directly to The "J" on the top right hand corner..

Me personally I would like to see everything right there vs having to go the spend credit page.. and I just think it makes sense to have it there...

Also I don't know how this fits into RP or Mafia in general, but I thought it would be nice to have a history log of some sort of all the hits on the hit list that have been taken.. 

I have to admit KingDee I think the first part of your suggestion is pretty pointless. There is no need really to have the same information in two different places when it is pretty easy to get the information you're looking for by other means. Maybe adding the option for "add .25c/.50c/.75 to spawn" or "spawn now for .xx credits" on to the spend credits page on the jail spawn part might be better? I think what you're asking for would fit better there. 

As for the history log of shots taken on the hitlist, I think that's interesting.