Menu and Menu Item Icons on Customizable Sidebar.

I think it would be a good idea to diffferentiate icons that are menus with more items and simple menu items because some menus has the same icon as one of their items and when you put them in the customizable sidebar and collapse it, they are undistinguishable. The difference could be a simple arrow ">" in the bottom right corner of the menu icons.  

Good idea. I second your proposal.

I third that

I think it's a neat idea, but, not important, crucial, or significantly helpful.

Unless you really customize the sidebar like I did. I love that everything I use can be reached in one click.