In my realistic city RP build, I aim to make it...realistic.  So if you could add stuff to your city rpg mo, otto, like speeding and elections, that would be awesome.
I also like a lot of the RPcore stuff like different ore and lumber types and fishing.  I also find the clickable infoblocks useful, so if you could incorporate that into your mod.  The only thing I don't like about RPCore was its lack of real estate and food.  Farming could be added using the same method as fishing where instead of a rod, you use a sythe or something.  Also with delivery jobs were made like pizza, a base salary but get extra money for selling stuff to other people by clicking or something.
And an addition to the cell phone mod would be good.  Landlines.  Have a phone brick.  Name it to the number you want.  Click to call another person's phone brick.  That person clicks their brick to answer, only allow the player to move away a certain distance, click again to hang up.  This could also be done with simple events: -->call, -->hangup/endcall, oncalled-->.  The call output event would make you type in a person's name.
I was really bored so I just typed stuff I was thinking.  Sorry about offtopicness.