A good use I see for "local scoped" is in C functions, which often have a hard time to properly free resources. With something like "local scoped", it would be enough one single function to mark a stack position as a scoped variable, to be finalized when the function exits.
+1 to this. Handling resource management in C is pretty cumbersome if the function calls any Lua function that might throw an exception (which is most).
