Need help!

Hi guys!
I'm trying XBMC on my Mackbook Pro instead of Frontrow and i thing it's very good.

Well... I configure XBMC in order to be launched with my apple remote (menu) and I use the apple remote for control xbmc.

My problems are:
- I can't control the system volume with the appel remote even if I quit XBMC. Is there a way to give back the standard apple remote feature when XBMC is not running?
- How can I sleep my mac while XBMC is running and with the remote? If I hold the play button it show me the info of the movies...