I saw a wiki page on GitHub that isn't open for editing. Then I forked the project, edited it on "my end" and tried to do a pull request. It turns out, the wiki isn't in the project, and there isn't a way to commit changes to it.
Other than e-mailing, is there a way to proceed if I want to suggest a change on the wiki in this case?
At this point I found out what seems like an alternative under "Questions with similar titles", but I couldn't do the pull request with it yet, and so I'm not sure submodules is a good way for this purpose. I now see I could probably branch it somehow... So is this the way to go?
GitHub now supports this and you can find details at Adding or editing wiki pages.
It's treated as a "normal" repository now, with branches, pull requests, commits, etc.