It would be great to have the posibility to change the color of each fence independently, I tend to use color coded tabs (in ObjectDock) to associate files related to projects, in my presentation laptop I left quick-access icons to multiple document and now have created a fence for each one organizing the document icons. Being able to change the color on a fence-by-fence basis would be great.
I think you could left-click on a fence so the menu will show a "Customize this fence..." option from there a dialog similar to the existing customize dialog would appear letting you select the color & transparency settings for that particular fence. Whenever you create a new fence it will take the setting set from the "general" fences settings dialog.
BTW, It would be great if the fence font could also be configured.
Just my two cents, thanks