Right now engines take whole block space for selection box, which makes harder to access things in complicated systems. But if selection box will have engine shape(but a bit bigger, like for normal blocks) it would be awesome and everybody, who annoyed about that will be happy.

Pull request is in progress.

The selection box is not the biggest problem. Maybe do some custom raytracing so you will be able to access stuff behind it. Like with vanilla stairs

Hey, almost done almost without any trickery.

OK, raytracing is done. Now just custom bounding box render.

nice work! this will be realy handy

PR is accepted.