Sapphire is still very much in active development. Below are listed the main features to be added in the near future.
If you would like to request a feature, please do so at the bottom of the page.
Raise/Lower brush tool that lowers/raises by a set amount, and doesn't re-apply to pixels in the same brush stroke. If possible, make linear or spline-based.
Select area tool in 3D.
Export selected area as mesh (aligned to patch boundaries).