I thought the information note in the command line arguments page could be enough to cover non-steam games added to it.
I mean.. Your additional paragraph is also good. But if I started to think like a newbie... that would be dispersive and confusing, imo
I'm open to other solutions.. but I have not atm... and for their sake I think a section for every game distributor could be enough (and non-steam games are common games after all)
Then.. another question.. why you replaced the universal resolution changer ...with 3d analyzer in the silent storm page?
Does it have any widescreen related feature?