time of day restrictions: yes. With WinGate 6.x you grant rights, which can be restricted by request and time of day (as well as other things). By granting restricted rights always, and unrestricted rights outside of work hours, you should get what you want.
Re VPN, in order to install network drivers you need to be an administrator, so yes, users will need admin privileges to install the VPN.
If you submit a ticket to our support desk with your email someone here can call you. Or send email to
sales@wingate.comRegards
Adrien