Although there's no common extension, the scripts of LiveCode objects have similar but distinct grammars from the two you provide. Could you add their grammar as well? For now, it would probably be the job of the user to specify a custom file extension for this grammar, or else to manually select it, but it would be a huge improvement over just using the "AppleScript" grammar for editing LiveCode scripts that have been saved outside of stacks.
Although there's no common extension, the scripts of LiveCode objects have similar but distinct grammars from the two you provide. Could you add their grammar as well? For now, it would probably be the job of the user to specify a custom file extension for this grammar, or else to manually select it, but it would be a huge improvement over just using the "AppleScript" grammar for editing LiveCode scripts that have been saved outside of stacks.