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To answer your question, future versions of XOOPS will have much better user management. There is no ETA on future releases, so there are no other options at present.
It's alright to post in the wrong topic, so long as you at least tried. One thing though, rty to avoid double posts, because your answers will get separated and this makes future searches hard for other users when the answers are divided between two posts.
No worries, just a heads up. If you don't get an answer, it's alright to bump your post after a couple days. Sometimes people dont have the answers, but others may notice if you give a poilite bump back to the top.