It would sometimes be nice if I could set or clear a function breakpoint directly from the Navigator. Use case:

1. User wants to set breakpoint on specific function in a long source file.
2. User finds func in Navigator
3. User either drag-and-drops function from Navigator to Breakpoints views, or right-clicks, chooses "Add breakpoint"

As it is, we have to perform another step 3 and 4:

3'. User double-clicks on func
4. The editor re-positions, the user then clicks in the margin, or uses Ctrl-Shift-F8

IMHO my suggestion seems intuitive. In fact, I was surprised it didn't work as *I* expected it to...  ;-)