i'm with zargon on this one. I can't see how to make the alarm system any more noticeable without it becoming intrusive. i'd like it if it would show up on both of my monitors in the lower right hand corner, but i'm pretty sure that's impossible, but other than that i don't know how to make it any better.
I play games R2P doesn't detect while running R2P, i'm still willing to game if i get an invite, but I definitely want it to be a small notification, not a giant thing that completely interrupts my game.