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No, there is no automatic way to do that.
And I totally disagree with your statement regarding "impractical." A a matter of fact runtime processing is very practical.
Well, in order to do blur effects, the symbol must be a movie clip symbol- rather than a graphic symbol, which I work with the most. I am relatively new to Flash, and movie symbols can be a little confusing for me.
I find this way impractical only because Premiere has a checkbox that automatically applies motion blur- but Flash requires you to tween it. This method does give you some control over the blur, but to me, it still seems tedious and unnecessary.
Also, I found that with the blur filter, you can only blur across the X or Y axis- is there any way to make the blur go in a diagonal direction?
That's pretty cool how that application was made to simplify the process. Although I think whether a symbol is a graphic, button, or movie clip, they are not hard to work with, although obviously the button and movie clip symbols have their own small intricacies to them.