Yes, to contribute to Wikipedia, you have to be comfortable accepting the conditions of Wikipedia's copyright license, which basically implies you are fine with other people mercilessly changing your work. Of course, if what you write is so good that it's hard to improve upon, then it's more likely to stay intact! :-)

Darij, those lists are automatically compiled, and consist of articles which somebody decided to "tag" with the relevant issue. Once the issue is solved, then you can untag the article, and it disappears from the list. Clearing backlogs is satisfying! :-)

Dick, almost all of what you have suggested is already exists, and it's called WikiProject Mathematics - and we'd like your help! en.wikipedia.org/wiki/Wikipedia:WikiProject_Mathematics

The best place to make such proposals would be on the talk page of WikiProject Mathematics (en.wikipedia.org/wiki/Wikipedia_talk:WikiProject_Mathematic‌​s ). That page has a lot of eyes on it, so you're likely to get a quick response. Indeed, those sorts of organization-type discussions are very common, and they often end in some kind of agreement.