Nope, you need to read the Dev`s site in detail, if the dGPU is called for by an application it will switch irrespective of gfxCardStatus installed or not. the Dev previously attempted to stop the switching, it resulted in havoc with a lot of applications, subsequently he removed the functionality from gfxCardStatus...
Q-6
Hm, that's different.
I use to use it on my cMBP and distinctly remember being able to prevent the dGPU from switching over. Maybe it was an older version of the app I suppose.