I know this probably won't make it into 3.2 if you accept it, and maybe not even 3.3 if it will exist, but I say that it is a much needed feature.
The front end of the forums can be extended with hooks, and so are all of the applications. However, there is one part of the forum that cannot be changed without file edits...
The ACP (Admin Control Panel) can only be changed with new applications (and settings etc with hooks), but the general layout stays the same. It has no hooks as such, and cannot be skinned without file edits (as far as I know!)
Please, at least think about implementing this. I don't care if it doesn't make it until even IPB 5, as long as it happens at some stage
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I think there should be an option to hide a usergroup from the moderating team page, but not from the member list. At the moment, the only option is to remove them from both at once (afaik - I'm guessing that is what it does).
In the ACP, you can add forums to categories, but you can't add subforums to those unless you go into the forum itself and add it from there, or manually move it in the drop-down box when making a new forum. Example:
I suggest that a new action is placed on said drop-down menu called "Create Subforum" or something similar. This will save many precious seconds and mistakes when making, remaking, or adding new forums.