I know. There are 6-lane to 2x 2-lane merges, which squash in the central lanes but look good. 4-lane roads are too narrow and I don't want to add too many road types.

At least add those that fit to the others.
I'm not demanding some new and weird variants.

Any new merges would have to be tapered, which doesn't look pretty and slows down traffic, because of the added bends. I was actually thinking of removing the tapered merges. It's also about keeping things simple. Or have you got an idea that might help?

Not really. It seems that specific road mods are even less possible than in Cities: Skylines.