Hmmm... no, not really.

Center dpad button is Select. It makes sense because you can use the dpad to navigate up/down on the scrolling list (I call it the Scroll Widget), then press center dpad to select the item beside the selection cursor.

Pause is the button between the volume rockers on top of the n800. The only unfortunately thing about this arrangement is that we usually expect that button to do fullscreen. Fullscreen has been temporarily moved to the otherwise unused Menu button (above Home). Eventually this will change as this button will actually pull up a menu.

I don't really have any interest in changing the button mappings, but Kagu is open source, so if you or anyone else wants to change something and submit a patch, feel free. GConf would probably be the best choice.