How to get setup programs' signatures...

Yep, I plan to. But since I have very different output types, I still don't know how to build a fast, small, easy-to-use GUI without spending more than 1 month for the initial version. I'm working on a small XML based GUI but that takes some time....
But you can consider it a promise that a new GUI will arrive.
Question: are you willing to have a 800K GUI for an 250K application? For me it sounds like overkill.