add a way to query the dimensions of a costume at compile-time

[aspizu]

something like a macro which returns the costume's width and height

COSTUME_WIDTH("costume name")
COSTUME_HEIGHT("costume name")

[faretek1]

sound length would also be helpful

[Bituvo]

I'm not sure if this is what you meant but you can also account for size and rotation using trigonometry. The sound length idea can also account for pitch effect.