I wonder if it would be useful to add a tab in the home, about koha section, displaying a list patches that have been applied to the specific koha installation, similar to the list of pearl modules. This could prove handy when trying to ascertain why a bug that doesn't exist in the main distribution manifests itself in some git derivative or other.
This development would be welcomed, however it seems unlikely that it will be fixed without a code submission by someone who is really interested in seeing this feature in Koha.
I am not sure how this could work outside of a git installation - I think you'd have to keep all the information about the patches in Koha somehow.
I can't see this really being practical. I think that it would require every bug patch set to include a database update of some kind, and its only utility would really be for debugging, which should mostly be done in koha-testing-docker anyway where you have easy access to the source code and database. I reckon this issue could probably be closed.
I agree with David on this one. It would also be hard to keep this information current, make it nicely searchable etc. We do note on bugzilla now which versions a patch has been released with, so things have improved since this has been filed.