I discovered some cheats in the Windows version. Might be useful for routing:
Open SSGWINCD.INI in a text editor and add CheatKeys=1 to the [Gizmos & Gadgets! CD] section. Alternatively you can use a debugger and set the int16 at 0x461A9C (game version 1.2) to 1. Then you can use these keyboard commands:

Ctrl-A:
Gives you the best of the required parts. Crashes the game if any of the required part slots is not empty.

Ctrl-B:
Adds 5 bananas.

Ctrl-F:
Toggle faster game speed.

Tab or Ctrl-I:
Toggle god mode: chimps don't hurt you when enabled.

Ctrl-P:
Increase score by 100 points.

Ctrl-U:
Teleport upstairs.

Ctrl-Y:
Unlock all doors.

Ctrl-Z:
Toggle "Pick a Puzzle". When enabled, you can choose the puzzle when going through a door. You can also skip the puzzle.

Ctrl+S turns off sound, but sadly I couldn’t find keys to turn off hints or voice, because the latter two seem to save time in runs.

Ctrl+S should already toggle both sound and voice.

It seems there is no hotkey for toggling hints: in v1.2 the int16 at 0x462790 specifies whether hints are disabled and there are only 3 functions that modify its value:
- 42AEC8 resets settings to their default values
- 42B1D8 reads settings from ssgwin.dat
- 43C4CF shows the toggle prompt

So the only way to disable hints via keyboard is to use the main menu: Alt+O, Down, Wait for prompt, Enter