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Splitscreen4 for Sandbox

Have up to 4 players ⅌ computer in a Sandbox session. Player 1 uses keyboard & mouse, Player 2 uses a game controller, Player 3 & Player 4 share the keyboard with Player 1 (unless ∃ multiple keyboards connected; no matter, Player 1, Player 3 & Player 4 must have different key bindings).
Press “home” (default) to open the split-screen panel. Here, local players can be removed or added back.
Press “/” (default) to open Player 1's keybindings (only applies when strict controller segregation is enabled).
Press BACK on the controller (default) to open Player 2's button mapping.
Press “,” (default) to open Player 3's keybindings.
Press ”.” (default) to open Player 4's keybindings.
§Known Issues
Player 3's keybindings overlap with some communication keybindings for Player 1 (i.e.: “y” is for moving Player 3 forward by default, it also opens text chat for Player 1). These communication keybindings can be rebound in Garry's Mod's settings.