how to PERMANENTLY disable "recently used"

[Ofnuts]

AFAIK, there are indeed two things:

1. The Gimp history: things that appear in File > Open recent with the full list in File > Open recent > History
   
2. The system history (may appear as "Recent files" in file dialogs) which is shared across applications (so, for instance, you can export a file in Gimp and find it very quickly to upload it with your browser).
   

I think the second can be disabled with Preferences > System resources > Document History > Keep record of used files in Recent Documents list.