I would like to see some sort of box with a 3D model of the selected material, possibly near the mini map, where more control of block positioning could be set. One could arrange the block in this 3D model in the position wanted for attachment to the build. This would make it much easier to position, as an example, slanted blocks in the upside down position or on the sides for builds with more details. Perhaps the “R” button functionality can enable it or just holding down a Key, say shift, would allow the block to be placed that way verses a standard cube.
Not sure if it’s been brought up already, but, just a thought I had.
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