Controls

OpenGTA reads the keyboard as the original reads it: raw scan codes, the original's keys, no remapping. What works depends on how far the port is (Status).

Frontend

As in the original, one key press per frame drives the menus; holding a key doesn't repeat.

Key	In the menus
Up Down	choose an entry, a mission
Left Right	change a setting, the player slot, the city
Enter	select, start the mission
Esc	back; on the start menu: the credits, then quit
Space	city select and results: the level's cutscene (once seen)
Del	player select: rename the player
R	player select: reset the player
letters, digits	rename: type the name

The frontend doesn't read gamepads (the original's menus only take keys).

In a level

The original reads its ten bindings from the registry, where GTA Settings.exe writes them; OpenGTA uses that tool's first preset:

Key	On foot	In a car
Up / Down	walk forward / back	accelerate / brake, reverse
Left / Right	turn	steer
Enter	get into the nearest car	get out
Space	jump	handbrake
Ctrl	fire
X / Z	next / previous weapon
Tab		horn, special

The key handler (Game_HandleKey) takes the original's function keys:

Key	Original function
Esc	the quit prompt
F5	next radio station
F6	freeze the game
F8	frame limiter on / off

City viewer

With front=0 (Launch parameters):

Key	Gamepad	What
Arrow keys	D-pad	move the camera target
Shift + arrows		move faster
Page Up / Page Down	L / R	target layer up / down
Esc		to the frontend

Runner keys

In gasm-run and the browser player, holding Esc for a second stops the game; a tap goes to the game. In the browser's fullscreen, the browser takes Esc to leave fullscreen first.