I think a nice feature would be a vote at the end of the game for the MVP
How this would be done though, is you vote for the OPPOSING team's MVP. I feel like this might be a nice way to get some support recognition for the great jobs they do. I know there have been many times that my team was crying about the enemy jungle, but damn it that Geb is WHY their jungle popped off.
So many times the enemy support is just playing out of their mind, and let's be honest, you hardly notice your own support. You however ALWAYS notice the enemy support.
This could get tied into the commendation system or whatever. I dunno, I just know that if I got to vote for the MVP on the opposing team, then usually I'm voting for the support or solo as they're the ones that I feel are the reason I lose games. Now, there are a few beast Scylla's and amazing jungle/ADCs I run into that would steal a vote. However, vast majority would be just giving love to the enemy tanks.
Just a thought I had when others were talking about ways to show that supports do a good job.