However, dont do this for an actual game - you'll end up scarring the game, or getting incorrect (if any) reporting.
Actually, if you do it right (Look at my thread) You can happily use a separate launcher for playing games. I've been doing it for quite a long time and haven't had a single issue because of it.
You simply have to launch the game first through the launcher so you get the battle file, then once the game has loaded up, close it, and launch again through your other launcher.
Just thought I'd throw that in there. >.<