As far as behavior is concerned, it doesn't make any difference whether you rescale one or the other as either one can be used to give the same shaped energy landscape.
Sorry if I was unclear. I would consider a FF a single restraint as it doesn't make sense to mix and match the terms (the fact that it is implemented using other things is an internal detail). I also explicitly excluded them since they are not satisfiable restraints (there is no sense of fit/not fit with a raw force field). Further, you can't really use a FF far from a good configuration and when you are close to optimum, the scaling issues don't matter so much (since all the satisfiable restraints must be near 0 anyway).