I've been looking for a mod which colours pipes more obviously so my bases are easier to read at a glance. This mod's /paint-pipes works well (I'm not interested in manually crafting coloured pipes), but removing and laying pipes after the fact don't pick up colour. Would it be possible to have a setting where pipes are coloured automatically depending on which liquid is inside of them?

I made a separate mod, https://mods.factorio.com/mod/color-coded-pipe-planner, that adds a planner tool to drag over your base.

You can also turn off the color coded pipe recipes in mod settings, and the planner will still work (robots will use base pipes to build the color coded ones)

Hopefully that’s close enough to what you’re wanting? Let me know if you have any feedback :)