Straightening and smoothening function are disabled. Suddenly when I double click, I can straighten all I want, but it alters the other frames' shapes in the motion tween. For an application at this age, I really don't feel that it is user-friendly.
it's not clear to me what you're doing nor what you're trying to do.
I believe that he is not happy that he has to double-click a symbol to edit it.
And he is also unhappy that after he has edited his symbol, the edit affects all other instances of that symbol.
Correct, for that reason I'm not happy to double-click