Oh, so blocking bots from indexing shortcuts. That is fine with me. In case you can point to some good resource on how to identify bots ;)
Uh, a simple robots.txt rule should do the trick. But I am not all that convinced we should block them. Why not let it find our nice short urls, especially if we reduce it to a single request as you suggested.
OK, I am not against showing the searh engines the short URLs ;) That may have a problem of more irrelevant results in searches though. Pages listed more then once with the same content (on www search engines).
Our shortcut URLs are also quite diverse, I don't know of any way to block robots from just those with a robots.txt rule. :(
Goba