At present, we have little to no guidelines with regard to disambiguations. The closest we currently have is https://musicbrainz.org/doc/Style/Artist#Disambiguation_comment, which only pertains to artists. What I propose is we have a general style guide for disambiguation comments, using the current guide for artists as a launching point. Here are some new guidelines that ought to be added:
Disambiguation comments should be entered in English, when possible.
Disambiguation comments should be capitalized as if they were Extra Title Information (ETI).