I remember seeing this the last time I explored this.  Our org is 24/7.  We needed a way to log off, IF the computer has been idle for a set amount of time.  We didn't want desktops logging off when people are in the middle of using them.

If you enable "Display warning before forced logoff", is there an option for the user to suspend the disconnect?

There also doesn't appear to be a way to designate what VDI pool you want this applied to.