Rotation and reference axes

Hi,

This may be too simple a question, but I just haven't been able to find solution.

I'd like to rotate the view of my protein a specific number of degrees (say 1.5 degrees) around an axis. Is there a way to do this? Using the mouse is not accurate enough and I don't use scripting.

Also, for publications it's nice to be able to show a set of reference XYZ axes or at least an arrow to point along the membrane normal. Is there such a function? I've seen in on papers using PyMol but haven't found a corresponding function in DS.

I'm using DS 3.1 Visualizer.

Thanks for your help!

Felix.