power off function isn't really a priority since it can only occur while the menu is in operation. The only fucntion I can see the GUI itself needing is adding a choice to exit to OSDSYS or mc?:/BOOT/BOOT.ELF. Maybe adding in the network config the ability to user define the port used.
Functionality is what is really needed with either improvements to game compatibility, or network throughput. those would be the priorities in development that I would tackle. :)
edit - looks like dlanor beat me to it. :D