Yeah, I really just don't use Steam super-often, so I don't want it running all the time, and yes, I can easily just close it after I'm done playing a Steam game, but it's not... elegant. It's like making sure your ISO files unmount themselves when you're done playing a game, or that a regular program clears itself from the cache by default. It's simple and elegant and doing it makes things feel... clean.
Thank you so much for screwing around with this and seeing if there's a way to make it work, by the way. I have/had no idea what Autohotkey was, and now I'm looking into it.