+1 I came here to post this same enhancement request.
Here's my use-case:
I have a PC at home, and a MAC at work. I use GIT to store all my files. When I'm done sequencing at home, I push my changes. I pull them at work, and can sequence in my down time at the office on my mac. But first, I have to update all the paths. Same thing when I get back home. Not the end of the world - just a minor pain in the rear.
I would prefer that image paths can either be absolute, or relative to the show directory.
In my case, I have an images subdirectory. So all my image paths would be "images/filename.png", and then going back and forth from work to home shouldn't require any "fixes".
Also, since PC uses back slashes, and Mac uses forward slashes. When I "open" a sequence, it should also swap the slashiness for all the filepaths automagically! :-P
This would be a big time saver for me!