New keywords are disable.x=username, enable.x=username, rename.x=from, to and delete.x=username which must stay in [Users.Operation]section in ini file. This section must stay in same file as [Users] section. Specifying existing users in [Users] section is btw. still possible.
I have this in my install.ini
[Users.Operation] delete.0=ASPNET disable.0=Administrator
Is this supposed to be shown in the GUI as