Here are the specific comments I had from my Enterasys contact regarding rebooting:
"You can reboot AP’s from the controller, but this cannot be timed.
At present the only way you could accomplish this would be to write a script that will SSH to the AP and issue the command to reboot it.
I have previously used a Linux tool called Expect that via a cron job would SSH to the controllers at a specific time at night and disable a VNS, and then repeat the process in the morning to enable the VNS.
You could use expect to schedule the AP’s to reboot.
I think Expect also has a Windows version as well."