Wauw, i played the game by myself and the game is amazing. it brings back memories, so i'm gonna watch DB again ^_^
the game itself can also be incredibly hard when you don't know what to do. with the japanese text and all, not been playing from the start (i played from where your movie ended, at chouzu) i din't know much about the controls in the early stage.
especially the emperor pilaf 3 robot transformation fight was incredibly hard for me. so seeing you beating these guys so fast is awesome to see.
anyway, in the first level, the first purple pteradoctail you enctourer, you wait for it to fly lower, and then combo his ass. wouldn't it be faster to attack him in the air, ie a upwards kick, plus a powerpole hit?
just a thought
also, when in the jungle, looking for roshi's stone, there are some blocks that block your path, so you destroy them, and can then move on. you destroy all blocks, while you could easily only destroy the first line, and then jump over the 2nd/3rd.
those are 2 points that came up to me after finishing the game and watching your wip run again.
anyway, doesn't kicking back missles do pretty much damage? if you're not close, and can kick back the missle, i guess it would be best to kick it back? unless you can't combo into all those fiercy attacks then... (meaning if it's slower, don't do it, even though it looks cool)
as for your other questions, i'm afraid that whatever is fastest, must be executed. i like veriety, but if something can be done faster, i'm afraid that for this kind of run, you'll have to do just that.