Outdated version:
It is still very unpolished and only works on windows but it might give you are slightly better workflow.
How I use it:
When hit Build&Run Multistart spawns 4 tiled game windows on my second monitor it then goes into playmode. The AutoConnect script will start the server in the editor and start the client on the 4 standalone game windows which will automatically connect to the server.
I will post an updated video soon.