It would be cool if a mod could extend the palette with new functionnality
Some ideas;
- Instant calculator
- Quickly add or check todo element in todolist
- Quickly go in specific page in factory planner or helmod

It would also make easier to add functionnality as modules.

If you look at how the existing sources are implemented: https://github.com/luan/factory-palette/tree/main/scripts/sources you'll see that you can already extend this pretty easily (although there may certainly be things missing from that interface). I even tried to add all of that to the README

I've made a calculator extension to exercise the extensions API here: https://github.com/luan/factory-palette-calculator -- It indeed required some extra work, but we now have a basic interface to integrate other mods. I'll change the built-in sources into the same format later (although I might not actually make a mod for each to keep things simple).