Compact 1x1 loaders that use electricity. They are able to use separate filters on each belt lane, and can stack items on belts if stack inserters are available.
add. old loader has some interesting featuer.
if loader is import(belt to chest)and it's nonebelt face other belt, than if target belt is straigt with loader, it work like balancer, if it target vertical, than item place far point.
if loader is export(chest to belt) and it's nonebelt face other blet, it take fillter item on other belt.
i'm sad these are not exist.
The Miniloader mod used in 1.1 is a completely different animal than this mod. Yes, the overall intent is the same and I used the same graphics. However, Miniloaders are inserters in disguise. That is why they strangely interact with belts on the non-belt side. There are other mods, or solutions to function as a lane balancer.