Hey one question

what size and smoothing of brush do you use to animate frame-by-frame

:Ohhhhh:

Any brush size or smoothing is fine. Its all a matter of preference. Use whatever you find easy and whatever comes out best. There is no "Right or wrong" way to animate its whatever works for you.

Couldn't have said it better myself.

if you ask me personally...I zoom in to 139% and use the 5th brush from the bottom, and if thats not confusing enough, It's the easiest thing in the world for me to understand. Simply put,..... for Flash5.0