Hey,

I was just wondering if there is a special string like CTRL or SHIFT or ALT that can be used as a key for an accelerator...

Something like:
SHIFT LCLICK = ID_OPEN_LINK_IN_BACKGROUND

to allow shift clicking a link to open a window in the background with that link...
You know, like opera and IE...

Thanks,
- Josiah

not yet. many requests for it, though, so maybe when it's supported in gecko, they'll add it.