On the Roles editor - on the 2nd tab to add JCR ACLs, the currently rendered layout is "unfavorable" on different levels - in consequence a user will fail to add any ACL there - besides the user decides to use the JCR app to add / check the values.

• It is impossible to see the value of the selected node.
  To add the / (instead of choosing a node) is a blind flight.
  Even if you add a value - you cannot see it later anymore.
• The given layout makes it hard to figure out which Add new button I have to click for for which workspace.

See screenshot(s).

Technically this is not a bug - no exception is thrown. But I have marked it as a bug since adding / editing roles is not possible on this UI (without "cheating").