@wengels464
I tried the CUE sheet idea with my collection. Didn't work. Seems like strawberry simply won't add DSF files to the library, even if it can read the metadata (which, at least on my system, it does perfectly if I try playing a tagged DSF file from my file manager).
Maybe there's some trick that I have yet to discover, though. If you have any luck with your own testing, do please post back here!