Normally i dont condone the use of tweens, at least in excess but really, akshunskribd?
Yes indeed it is possible to script it but then your animation relies on script to run, a good animator can export in flash 1 with little or no problems, dont rely on those things in flash , if you can do it on paper then good otherwise no . I draw the line at tweening when you need to move a large scenery object or a character running for a while but script?
Its easier and more effective to tween , basically tweening IS the code, just prefabricated for easy use.
Dont make the good people at adobe feel like they have wasted their time :'(