An option to keep the game running when not in focus

[Guest]

Currently when gzdoom window is not in focus, the game will pause.
However, I think, that allowing the game to run (and intercept controller input) while the window is not focused akin to source games would allow for a makeshift split-screen experience by connecting to a localhost server.
Here is a representation of how that would look: https://imgur.com/4Br9yPX
Something like this https://youtu.be/LutfKPr_hIc?t=242 except without the use of third party virtualization utilities.

[Graf Zahl]

This already exists. Set 'vid_activeinbackground' to 1 in the console and it should do what you want. For technical reasons this only works in windowed mode, not in fullscreen.