At the moment Color Control FX disables the use of all other FX, but RGB sliders are separated from FX, and thus can be used at the same time.
My suggestion is to either also separate the Color Control FX from FX, or instead replace the RGB Sliders to the FX types and Color Control into the place of RGB sliders.
Reason: In location, tweaking contrast, brightness and saturation is usually needed. The RGB sliders are needed a lot less. This is in my work, but I'm pretty sure that majority of users use more color controls than RGB sliders.The color controls don't probably need that much more computer resourges compared to the RGB sliders.