Next MBS FileMaker Plugin will have an option to show Layout IDs in the Layout Management dialog:
Of course I added new SyntaxColoring functions to enable or disable this by script as well as a preference dialog option for those who don't like this.
If the same name is used for several layouts, the plugin will not show the ID as it's not unambiguous.
Coming to the new next MBS Plugin prerelease in a few days. Or email for an early test copy.
Works fine in FileMaker 11 to 16 here.