Not really. Not in the sense of it at least. The magnet links get
handled in a manner that isnt possible, in a conventional sense.
http://userscripts.org/scripts/show/48830 - is a greasemonkey script
designed to permit a magnet like linking style with rtgui. Thats
actually a lie really, as it doesnt do a magnet link in the sense of
the word. But the not having to download it, then upload it, or copy
and paste the link is about as close as you'll get