In case only tag editing is needed check Professional Tag Editor.
It supports DFF and DSF audio files as well and a lot of standard file formats too for the same price.
Also you might wish to check MP4 Stream Editor.
It supports the same taging functionality and also editing (copying cuts, etc.) DFF and DSF files decodelessly (preserving 100% quality of the source).
DSD Tag Editor & Converter is a shareware software. Unregistered version is a fully functional 25 day trial version with a 50 taging limit. If you like this software please register.