BCWipe works the way you want: it adds an "empty with wiping" option to the recycle bin right click menu. You can also wipe individual files and empty disk space.
Unfortunately, it is not free. You can purchase it on its own and it is also included with the BestCrypt encryption software. There may be something free out there that does the same thing, but seeing how BCWipe is exactly what you asked for, I thought I'd mention it.
P.S. The trial versions are fully functional for 30 days.
