A Royal Server dev here: thats good input and we will have a look on how to integrate this in future versions. cheers, Michael
As of Royal Server 4.01.50624 there are settings in %AppData%\RoyalServer\appsettings.json to skip automatic setup of firewall rules.
Airidas Svobūnas
It would be nice after restarting server it would not revert firewall rules back to its default.