Lahma , thanks again for the plugin. Most of what you say in this paragraph is a pretty accurate description of my setup, and I can see why you might not see the point of RocketLauncher.
I'm quite new to it myself but the fade screens look awesome, and are very good at hiding console windows etc. when switching between programs; the integrated Pause menu looks great (cant get it to work by controller shortcut yet) and the controller support/priority options .. to name but a few of the useful features it has for me. And the reason for adding Steam Launcher to this setup, is as I stated in my original post, I think it'd be great to get Steam Launcher and Parsec multiplayer streaming working together.. Anyway..
Thanks for all the info folks, much appreciated, but I think anything else I need to know about this subject belongs in another thread for now. I'll post back here if I get it all working together though.