Session/Device Timeouts

Session/Device Timeouts

My goal is to shut down thin clients that are left on or idle rather than leave them on overnight. To that end I've been playing around with device timeouts and have come across this config in my testing:

inactive = 3 nosessiontimer=1
autosignoff = yes shutdown = yes

With this config if the station is idle with a citrix app open and running, it times out and shuts the thin client down after 3 minutes - great
If there are no apps open but the user has logged on to citrix and sees their citrix icons on their desktop, the system shuts down after being idle for 1 min - great

However, if the system is turned on and left at the login prompt, or if the user actually logs out (again back at the login prompt) then the session timeouts have no effect. Is there something I'm missing? It seems that nosessiontimer should apply in that situation but doesn't.