Hello Meow,
Currently the base plane for the Height-field rendering is estimated automatically as the principal plane of the reconstructed data. I agree that this may be a limitation in some cases. For example, when processing georeferenced data, it may be advantageous to select the horizontal plane. Can you please provide more information about your specific case? Maybe a screenshot demonstrating undesired behavior, or an explanation why the default plane is not satisfactory. This will be helpful to select the optimal solution.
The bounding box rotation option is a planned feature, but is not yet implemented.
With best regards,
Dmitry Semyonov
AgiSoft LLC