P: Separate panel end marks for left and right panel groups

I use a custom panel end mark with a graphical legend for my stars and colors. It's handy to have as a reminder when in the library module. Here's an example:

It would be helpful to have a different graphic end panel for the development panel group with my workflow reminders like optimal order of steps, finishing notes, etc.  Essentially like a develop sticky note. But there isn't currently a way to do this.

So, my suggestion is to allow different end panel marks for the left and right panel groups.