Thanks for your help!
I know i can do this; E.g. scrape a "setup *.Exe" as a "game.exe" tricking Launchbox to think i would scrape an already installed game, then run the setup it with Lauchbox, and then in the metadata edit screen change the setup.exe manually to the newly installed game.exe.
I just hoped there would be a more elegant or automated way to do this. Or maybe someone else would have a workaround i could not think of.
But i understand now i would not be doable to Launchbox to automate this and this was wishful thinking on my part. And the manually editing is really not that big of a deal anyway for the few games i install manually.
Thanks again!