So today I needed to export the whole config again to find the user I could not delete was in Wireless > Hotspots
Administrative users
of one or more Hotspots.
This is really PITA - the export configs takes ~5 minutes to prepare the tar file.
There is still no reference in the user list just like you have brought us with references for hosts and services which a really useful upgrade in usability.
Is this about to come eventually?