Run arguments per game instance

[kubecz3k]

Describe the project you are working on

Multiplayer world building game

Describe the problem or limitation you are having in your project

When using Debug -> Run multiple instances -> 3 it's impossible to define different run arguments per instance of the game.
It would be the best if we could for example define --server argument for the first instance and --client arguments for other instances

Describe the feature / enhancement and how it helps to overcome the problem or limitation

In Project Settings -> Editor -> Run instead of one field Main Run Args there should be 4 fields, one per each application instance

Describe how your proposal will work, with code, pseudo-code, mock-ups, and/or diagrams

If this enhancement will not be used often, can it be worked around with a few lines of script?

Not in an obvious way

Is there a reason why this should be core and not an add-on in the asset library?

Ability to run multiple app instances is core feature of the editor, this proposal is small quality of life improvement for it

[KoBeWi]

Duplicate of #522
It has a WIP implementation that is already usable (just needs polishing): godotengine/godot#65753

[kubecz3k]

hah had notion I had seen some discussion about it but could not find it in any way with key words like 'run arguments' 'run args'... I guess the title could be more explicit