This is a good request. Often enough I want to click on the second or third to last page of a long thread because that many posts have been added to it since my last read. I've seen other boards that do something like the first few pages and the last few pages. I'll bet this is possible once they get some time to work on it.
Note that in the meantime you can manually edit the URL to any page you like. Here's an example URL for a multi-page thread:
http://www.flyertalk.com/forum/showt...=309996&page=3
So you can edit that number at the end to the appropriate page. Not a big deal on a 3-page thread, but if it's a 50-page thread and you need page 30, that's the way to do it for now.