Hi,
One thing that is missing in the catalog, and relatively hard to find at common distributors, is a 2-step pushbutton (like found on pretty much any digital camera out there).
As Sparkfun could get us the PS3 joystick, that should be a no-brainer 
Preferably 2 individual contacts, if not possible (does that actually exist at all?) one shared contact is fine too.
If possible as well, a version with 10mm long push part…