This is great news.
An acorn electron was my first computer, and i loved many of the games available for it. I dont think beebem plays electron games, but it is just a beefed up version of the same system, so i think many of the same games are available for the beeb (Yay!)
I actually considered trying to port the "electrem" emulator a while back, perhaps i'll still try, lots of free time coming up.
As for suggestions, i'd love to have usb keyboard support, kinda essential i guess.
And the ability to boot with no game loaded for writing programs and what not would be excellent.
Oh! and xports ability to accept custom launch paramaters (For launching games directly from XBMC).... also the ability that when a game has been launched this way, when you exit the game it falls back to the launching app (Source pretty much a copy and paste from xports emu's i'd guess).
Anyway, thanks for this, and good luck.
Shorty
Also while i'm on about electrem, it's GUI (Classic not future) Is great, simple, functional, elegant and perfect for a tv screen.
http://electrem.acornelectron.co.uk/ if you are interested.
Shorty