Burner Inserters can take fuel from any entity (ie. furnaces). Updated for Factorio 2.0 and Space Age
Providing the player with new tools or adjusting the game interface, without fundamentally changing gameplay.
Augmented or new ways of transporting materials - belts, inserters, pipes!
Could you allow other inserters to move coal rather than just burners?
Sure. I'll add it as a mod setting incase other people don't want that due to possible performance hit.