Rename Selection Set and different Color

Hello,
I am working on a point labeling application for point clouds, where a user should pick some single
points and assign a label to it. For this I thought I could use the O3DVisualizer with the Selection Sets feature.
To really make it intuitive for the user I thought I could name the different sets to match the label names and I also would like
to change the color of the rendered picked points to be different between the sets (currently all picked points get the same
color does not matter in which set it is). So my question would be: 1) is it possible to rename selection sets? 2) can I assign different colors to different selection sets? 3) is it possible to create selection sets in advance via code so the user does not need to click the "+" button?

Thanks in advance!