1.  Wireguard needs the ability to download the profile for you.  I haven't been able to get mine to work on my ER707 so I dunno.

2.  Again DHCP Reseveration with the ability to add custom dns to the reservations. 

3.  My Public IP address does not show for my ER707, just says the same as the LAN.

4.  Not really sure what SSL VPN is?  Is that OpenVPN? .....

5.  Would love the abililty to port forward based on URL/Domain name...... eg if you wanted to host multiple web servers on different virtual/phyiscal machines etc.