None of you actually answered what he is asking. Specifically he wants a downloader that uses delayed download and allows you to use F1 even while you're downloading the rest of the scripts. I don't know if a script exists for doing this.
If you'd like to contribute, I started on a full dxGUI library although I don't have time to do much with it.
https://github.com/Woovie/dxGUI
If you're interested, give me your github name and I'll gladly add you as a contributor.
Why not make it so you can have any tab have what you want? Do it like MMOs do where you have a popup that has some checkboxes to choose what is displayed on said tab. That way you could have the user choose what they want.
Hmm.. I hope this would have a solution.
For now you can check the properties of the elements and manually type in each other element it is pointing to.