Welcome @hansqpeter. Importing Windows games is unfortunately more of a challenge than it seems. I haven't seen it done before elsewhere, and for good reason, unfortunately. Games often have more than one EXE, so it's often not straightforward, and hunting for only games in Program Files is pretty much impossible, which is why we chose to go with the Start menu solution.
That said, I can see a drag and drop option making sense, with the understanding that it'll get the EXE wrong sometimes. I'll add that to my list. :)