There is no possibility for adding credentials for a Login via OpenVPN-Client - this is making this function useless or expose for high risk of entering my home server if my laptop or any other device using OpenVPN-Client would be for example stolen!

Please fix that in the next firmware update, it's necessary for security protection - many of your competitors have such function.

Otherwise OpenVPN Server function provided by the router is just useless, cannot be recommended for professional use.