The actual final raspxbmc version of February 2nd 2013 works perfect compared to the previous code drops. I have a Hama MCE remote control and it now works perfectly. Even the mouse pad works fine out of the box. Unfortunately the Context menu doesn't work - at least that's what I thought and read in the net. I spent hours to find a way to get this fixed and finally detected the file /opt/xbmc-bcm/xbmc-bin/share/xbmc/system/keymaps/hama_mce.xml on my pi and detected that contextmenu function is already mapped to a key on my hama MCE. But I didn't expect this key to be the contextmenu key.
Contents of the file:
<numpadtimes>Info</numpadtimes> <!--star key -->
<numpadfive mod="alt">ContextMenu</numpadfive> <!--hash key -->
<return mod="alt">XBMC.ActivateWindow(Home)</return> <!--Start key -->
<f4 mod="alt">Info</f4> <!--close key -->
<r mod="ctrl">Info</r> <!--record key -->