Yes, and this is by design. However the controlling logic will probably have to be customized for each additional game.

Euro Truck Simulator was chosen because it runs on Windows/OS X/Linux, and because the game consists mainly of highway roads, which is an easier target than urban environments.

Also I just really like the game itself.

This is really cool. Consider introducing this concept to an FPS game, at what point do you consider it to be an aimbot?

That is exactly what aimbots are. Sometimes you can make bots easier by using an addon system to export information(WoW), or themes to color your targets (CS), but at the root you read the screen and control the mouse.

No. At root you read and write the game's memory. Most aimbots just read the memory to get locations and call the game's own methods to adjust the aim from their injected dll. Barely any actually bother reading the screen, it's horribly inefficient and limited.

I've used and written a ton of bots that read the screen, sometimes it's the best option.

Ditto, but with manipulating the game directly either through memory reading/writing, dll injection or packet sniffing.

Can you give some examples where screen reading was more effective?