This is a good idea! I suggest you use a “myxwikiorg” tag instead though. That allows better categorization that some text. I’ve tagged one issue to show how it in action: [myxwiki.org] No macro at all
Then we can see all topics related to myxwiki.org here: https://forum.xwiki.org/tags/myxwikiorg
Very good! And yes it’s very nice that you started different topics on problems you discovered.
I think the biggest one which has various consequences are the Programming permissions. This causes problems during upgrades and more (pages which have PR loose PR during upgrade if they’ve been changed in the xwiki distribution for example).
Thanks for the initiative!