I hardly call a few tiles wasting space, even if those pictures (especially the first) didn't employ the tactic, it wouldn't have resulted in space for more buildings. If using 3 tiles is too many, a simple splitter with with 1 piece of conveyor going back into the original conveyor only takes up 2...

I think the loader concept that was brought up a couple Fun Friday Fact's ago may accomplish this for you, but apart from that I think there are enough ways to ensure items end up on both sides of a belt that I don't feel another type of inserter is needed. Here are some examples of how to use both...

Before i suggest my idea, i just want to say i absolutely love this game! My idea is to help inserter placement. Insterters tend to place resources on one side of a belt. Instead of doing that why dont we make it so that it places on both sides of a belt? It will help with furnace efficiency and not...