I ran into another case where I need to use a nested AD group with UserAuth. I was thinking about creating a PowerShell function to do this... Is there a variable that can be passed back to UI++ to let it know an external authorization check succeeded?
It's not documented (I don't remember if I intentionally left it undocumented or not), but there is an attribute named ExitCodeVariable for the ExternalCall action that sets a variable to store the exit code from the called process. That's not exactly what you are asking about though I don't think. If not, then no, not directly. You can easily set a TS variable in your called script though that does this.