Then, maybe, just (eventually) add a sub-category for ost's (just, imo, there's enough of them w/ enough 'consistencies'/'constanants' to equal strategy guides).
Then, maybe, *instead* of adding any more "mini"/"sub"-categories...let the vagueness/looseness of the "Swag" category be left up to each individual user as to what they want/don't want to track & list in their collection.
I think that this would keep everything simpler (for the site), while leaving everything open enough to each individual user.
Just my 2 cents-