Storm Tracer only runs with the XStacy::Elements installed.
But to Clear things up, XStacy GUI doesn’t patch cinema unless you want it to. And lets say you did want to, but then wanted certain plugins not to be patched, you can patch or unpatch folder by folder if you wish, giving you complete control over what gets the treatment.
So far I’ve had no incompatabilities with anything (plugins or otherwise) which have been enhanced with XStacy. The patch is context sensitive to whats already there and is safe (it backs up as it goes along). Cinema 4D plugins rarely interfere with each other, unless someone doesn’t get a new ID there is no reason to believe that you will ever get any incompatabilities between any plugins in Cinema. So I really wouldn’t worry yourself