Got it to work after a reboot. Also, the = is important because that is a variable field (my testing has concluded). Blank, or a 0 will restrict 1 appearance. 1 will restrict 2 appearances. I kinda noticed a pattern at that point, so I'm guessing a 2 will restrict 3 appearances, etc.
Crashtest,
I came across a thread on here last week regarding the RESTRICT_LAST_CA= hack in the system. We've got a problem where if you are a member of a huntgroup that has Call Waiting (such as our Attendants HG), you might fill up all your Call Appearances, thus be unable to transfer a call. We've had it happen and its a pain. Basically, you do the same thing you do with this ACD delay (put it in the NO User Short Codes). What I was missing was the reboot to impliment, until it was mentioned in this thread.
Thanks...
Kris G.