What inspired this wish list request?
Few posts I found from community and pinning ruler could also be fairly helpful from time to time.
What is the improvement you would like to see?
Ability to pin rulers and crosshairs to graphs (with crosshairs it should be possible to hide the aiming circle). Could also be helpful to be able to add multiple of them and possibly have some additional settings such as colors (for ruler also changing increment).
Why is this idea important?
Provides additional tools to annotate your graphs
