TL;DR
A way to quickly switch between sets of enabled mods

What ?
In the mod menu, allow creation and use of presets. Feature components
* Create a named preset
* Select a preset
* Rename the selected preset
* Update the selected preset to match the mods currently checked
* Switch the set of ...

Chemical plants that are making recipes with only liquid inputs over-buffer their output.

Inserters stop inserting into plants when the output starts to get over-filled, but pipes continue to input fluid into plants that have plenty of output buffered. Plants/assemblers should stop accepting input ...