I've abandoned my efforts to get the ipazzports to work, in favor of the latest arrivals, 3 rii 6i mini keyboards with IR remote,...
They are absolutely the singularly BEST HTPC keyboards in existence, and reasonably priced... (see pic below). Compact, easy to use, functionality galore (you can simulate a mouse scroll wheel by hitting the function key and scrolling your finger up and down on the touch pad, ... unbelievably awesome for scrolling through channels in live TV mode).
Enough of my unpaid sponsorship, though,... I would still like to explore how the keyboard shortcuts are assigned in LinuxMCE. Remapping them may become a feature we might want to explore, and one I would like to pursue in my (fleeting) spare time. How are the keyboard shortcuts defined??