Are you planning on adding some more control buttons, like volume control, zone control, maybe EQ ? VOlume is pretty important - have I missed this somewhere ?? The only other button might be the power off button, if it gives you the option to minimise, shut down/standby etc. I think minimise is important at the very least.
Also as an aside, as far as I am aware, I cannot use SageTV in Australia. I am using a program which I think is similar to Sage, which controls digital TV, HDTV material, DVD, audio etc. I am wondering how hard it would be to somehow integrate this program into Xlobby (instead of Sage - but with the same type of controls), so that I can launch it to control my TV viewing? This is the only area that xlobby now lacks for me - TV control.