Firstly let me say thanks for FastScripts, it's a terrific timesaver. Keeping in with the whole keyboard loving power user vibe I'd like to suggest an (imho) improvement.
I'm often tweaking scripts, and it's a bit of a drag to dig through the menu to find the one I want. So: how about a special key that puts FastScripts into "edit script" mode? Hit the system-wide, user-defined trigger. FastScripts' icon changes colour to indicate that it's waiting for you to hit another key combo. Typing an assigned shortcut then opens the relevant script in its default editor. Time = saved! It's effectively like option-clicking the menu item, only without even having to open the menu. Another system wide trigger would let you reveal the script with its shortcut, as if you'd shift-clicked it in the menu. Typing an undefined shortcut or hitting escape returns FastScripts to normal mode.
No idea how difficult that would be to implement, but it'd be verrrry convenient for this script aficionado...