The way LinqPad handles containers and UI updates works really well for this type of admin tool. The separation of different UI sections makes the workflow intuitive:

Enter a user ID and find the user
See the current permissions
Make your changes
Save and see the results

This approach could easily be adapted for other administrative tasks like:

Managing user roles
Configuring application settings
Reviewing and approving content
Batch processing operations

It's impressive how much functionality LinqPad offers for creating quick utility tools like this. You get a lot of the benefits of a full GUI application without the overhead of creating a complete project.
Thanks for the opportunity to work on this with you!