Well, I finally tried it and it's awesome, it boots instantly compared to the gdemu manager.
I have two problems now, first, none of the games have synopsis, in all it says "Game Synopsis here", which I don't really care.
But also, many games don't have a cover, it says "image missing", is there a way to manually add the covers somehow?
The other problem will be finding the GDI files of my CDI games...
Thanks for the software, I don't think I'll come back to gdmenu