Not shorten links that start with...

How about having the ability to turn off link shortening for links that begin with or contain "XYZ". For example, not shorten already short links, like twitpic.com, bit.ly, tinyurl, bkite.com etc? I have began using Tweetie and using the ping.fm integration, and when I post a pic on there, it posts to Twitter with the twitpic.com link, but everything else with a ping.fm link.

This messes up social consolidators like Socialthing, since it sees these as different posts. Also, I'd like my Facebook friends to see the link is a twitpic and not a URL to a website or something. Just an idea.