STL transform not selectable?

I am making a 3D carve of an island using an STL from TopoMiller. Annoyingly, the long axis of the island is not nicely east-west and so I’d like to rotate the model by a set amount so that I can also make a North arrow and rotate it by the same amount and v-carve it into the water. When I click on any of the transformation buttons, however, nothing happens. I can freehand the rotation by dragging the corners of the model, but there isn’t a snap-to or any other way I can figure out to constrain the rotation to a known amount.

I’m running Carbide Create PRO build 842 on Arch Linux using Wine, so I am running an unsupported OS, but every other feature works just fine so I find it hard to believe that’s the only feature that doesn’t quite work.

So, I’m either reporting a bug or requesting a feature. Not sure which.

Adjacent topic: when I move or rotate the model off of the stock, the model gets permanently truncated. I wish it would just get hidden when off the stock so I could move it around and then trim it later with a polygon without having to start over if I need to make a later adjustment.

I wish it would just let the model build outside the workpiece. We can trim it if we want to.
It’s common to build model elements longer than necessary to trim the ends off, or just leave them & avoid cutting those areas.

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