I was already thinking about implementing mod like this recently. I want the ability to drive along a wall and pick up items faster. But the car moves too fast. I typically manage this by manually pumping the accelerator, but that is error prone. It would be great if I could set a lower top speed ...

I'm not entirely sure what you are trying to achieve here, but there is something you may be interested in:

mods are stored in a directory called "mods" inside your game folder (right next to saves). The executable has an option to specify a different directory. So, without having different saves ...

When processing an on_selected_entity_changed event, I would like to know if the rail planner is active (as distinguished from a rail item in the cursor stack). In my research, I don't think this is possible, but perhaps I missed something?

If this is not possible, I would like to request an API ...

I would be particularly interested in this feature.

The holmium-solution recipe requires 2 holmium-ore, 1 stone, and 10 water. By default, holmium-ore is not used for anything else. So, if I have higher quality holmium-ore (whether intentionally or not), the only way to consume it is to create ...