Right now, there are something like 2900 UM system prompts. It's not supported to change them, and installing a CU overwrites them. It would be nice to have it supported to change them, along with a list of which prompts contain which message.
Right now, when you disable someone from UM, it leaves the EUM addresses assigned to the user. It would be nice to see a prompt asking if you'd like those removed. Otherwise you have to manually remove them to make that extension available for another user.