I don't think it's easy to add items to the desktop right click menu. But I found some info using google:
Vista:
Add Any Application to the Desktop Right-Click Menu in Vista:
howtogeek.com/howto/windows- ... -in-vista/
XP (not recommended):
A Complete Tutorial to Customize Desktop Context Menu in Windows XP:
askvg.com/a-complete-tutoria ... ce-hacker/
Alternatively, you could also use DOpus floating toolbars:
(and use a system-wide hotkey): [Shortcut popup menu. is it posible?)