I voted yes, eventhough ISPConfig2 is kind of outdated when looking at the existence of ISPConfig3.
Don't get me wrong I still use ISPconfig2 instead of 3 but as I generally plan to migrate to 3, getting features in 2 that I will miss in 3 makes the migration harder.
Another option could be, depending on the requirements, to disallow the remote connection to mysql, e.g. via iptables and moreover set up s-tunnel on both the server and "client" side to take care of the encryption for the remote sql connections.
Anyway a nice feature though. Maybe you might think of "patching" ISPConfig3 as well?