Of course we would love to see some flexibility. The issue is simply how they can open up the flexibility without having to worry about the inevitable wave of obscenities that some developers would find humorous to put in there. Hopefully the rich presence will evolve over time, but definitely voice your opinions
on Connect so the team know what people want. And with something like this (and most requests), try to be as detailed as possible about things so they know exactly what you want, why you want it, and perhaps even how you see the public API methods. All of this can really help the team in deciding future features.