If they are completed projects that are not often revisited, could you move some of them to an archive folder, and just move em back and add by browse if you need them again.
Not your desired solution, But this will give you a short list of currently active projects.
T.S.
If you mean here:
Then I don't think so. You would probably have to make your own document (in a word processor or something) for something like this.
Cameron Whetten
Inventor 2012
There really isn't anything you can do to customize the project editor dialog box. I don't think Inventor is going to offer you a solution to this particular problem.
I'm afraid you'll have to do something else, like write up a Word doc or excel sheet with your project names next to some nifty little pictures you screen-capped or rendered from Inventor.
Cameron Whetten
Inventor 2012