Information provided by 2BitCrook.
Updated for GB Studio 4.x.
[and]Cycle through preset palettes for non-color games.A+B+Start+SelectSoft reset the system.BackspaceRewind play.
Alt- Changes "Add Event" button to "Paste Event".
PSet player position in a scene.AAdd new actor.SAdd new scene.TAdd new trigger.EEnable eraser mode.CEnable collision mode.ZEnable colour mode.BackspaceDelete a tile or frame.Long Right Clickon Palette Slot = Change the palette.
Ctrl+ASelect all tiles on the canvas.Ctrl+CCopy selected tiles.Arrow KeysMove selected tiles 1 pixel in respective direction.DeleteDelete selected tiles.EscapeUnselect all tiles.Shift+Right ClickSelect/unselect tiles.
Ctrl+CCopy colour from selected slot.Ctrl+VPaste colour into selected slot.