Thanks for the list with the PAL changes. I'll have a look at it later.
Sure! I assume this wiki page also means general regional differences as well?
Probotector vs contra and that kind of stuff?
I agree with Dwedit here: The NESDev wiki is focused on things that are interesting from a technical and development point of view. Things that might be helpful for fellow developers.
Cosmetic changes like robots instead of humans or visual censorship are not really relevant on a development wiki.
Unless the visual changes are based on technical stuff, of course.
For example, as far as I remember, the Japanese version of "Contra" uses a different mapper which allowed the more dynamic backgrounds that became static in the US and PAL version.