UPS-friendly 1x1 loaders.
Mods introducing new content into the game.
Augmented or new ways of transporting materials - belts, inserters, pipes!
The last few versions of miniloaders I've played have had a mod setting to enable "craft as pair" so you will always use 2 underground belts and make 2 miniloaders. It's a small thing but it would be nice.
This is implemented as a startup setting in 0.11.0
