It's A-OK to list unofficial fixes. HOWEVER, you have to clearly state:
I. How it was fixed with a description and link to the source.
II. What settings or visual qualities were removed or adjusted to do this fix. These are things that get chosen from the required settings reduction menu.
So for example, let's say you had to turn off a shader or remove shadows as part of the fix, this has to be clearly stated and selected - you can't keep secrets.