There is currently no ready-made install-script for The Saboteur for PlayOnLinux available.

But installation of the game in PoL is very easy:

1) create a new PlayOnLinux-drive
- choose all three available options (other Wine-Version, configure Wine, install packages)
- I'm using Wine version 1.9.8, but others may also work
- configure wine to show a local desktop of 800 x 600
- install package d3dx9

2) install the game using the GOG-installer
- ignore the error-message at the last install step
- create a shortcut to Saboteur.exe

3) start the game for the first time.
- choose your options
- save the game!
- exit the game

4) now you have to manually edit the file config.ini, which is located for me in ~/documents/My Games/The Saboteur™/SaveGames (you may have a different path setting)
- choose the parameters, as you like and depending on your hardware. If you get low FPS, experiment. :-)

Here is my current config.ini:

DisplayProfile 2
ScreenWidth 1920
ScreenHeight 1080
TextureQuality 2
SliceQuality 1
ClipRange 3
ObjectQuality 1
RainDensity 75
Shadows 1
RefreshRate 60
PostProcessing 1
VSync 0
Windowed 0

// Available Fullscreen Resolutions
// 800x600 @ 60Hz
// 640x480 @ 60Hz
// 1024x768 @ 60Hz
// 1152x864 @ 60Hz
// 1280x960 @ 60Hz
// 1280x1024 @ 60Hz
// 1400x1050 @ 60Hz
// 1920x1080 @ 60Hz