Here's a little tidbit that may allow some guys to get something working. PocketShield developers have been able to get the RSK long key press to be mapped..
http://forums.jdbp.mobi/phorum/read.php?2,5254
They use the following reg keys to accomplish assigning their own app to the long press:
HKEY_LOCAL_MACHINE\Software\PocketShield\KY_ENDLON G=133 (DWORD type)
HKEY_CURRENT_USER\Software\HTC\LongPressEndKey\Aut oExecute=2 (DWORD type)
When I enable this in PocketShield, I do get the desired affect, except it screws up the hardware Volume buttons and no longer function. Pressing either will bring up the onscreen volume bar, but you have to use a finger to change the volume.
Hopefully this helps a little.
*EDIT:
Here are all the keycodes:
http://msdn.microsoft.com/en-us/library/bb431750.aspx