First option : In-game friend Button
So I have put some time into this game about 145 hours and I have come across where I have met many fun people to play with however once the match ends that's it unless you have plenty of room on your steam account. I just think for normal matches it would be nice if the developers could implement a compliment section and or in game friend option.

Second Option : Juke Box
In game juke box would be pretty entertaining as well, with of course No copy right music so that way licensing wouldn't be an issue, but it would be another fun little feature to the game on where the table to vote for songs played while lying their way to victory in the bar.