We run a MediaWiki, where we have a good, contributing user who agreed to be given temporary powers as an administrator, explicitly with the instructions to only manage the protection and erasure of a very specific set of pages. Nothing more.
Now, this user who was temporarily given mod powers solely for technical tasks is overreaching and acting like an administrator. They have deleted pages outside their explicit purview (correctly deleted, as per rules, just shoudl've been by an actual fully-fledged admin), and threatened disruptive users with blocks, and even blocked one today (again, rightfully so by the rules. I would've done so first, if I was there).
I've talked to them about this already, asking them to at the very least ask an admin before taking any admin actions, but they haven't changed their behaviour at all. I have two questions about this:
1) Am I being unreasonable in expecting this user to limit their moderation activity to these specific pages? It is 100% clear whether a page falls under their influence or not, so there should no misunderstanding here. I'm not trying to step on anyone, here, just do what makes sense.
2) How can we stop this without falling out with this user? I'd rather not go "You kept doing this so no admin powers bam", because this user contributes a lot of good things, and it's not like their adminning is bad, as such. I'd prefer not tot fall out with them, if possible.