I think at this point in the game, it really doesn't matter. If there was some amazing Up Smash revelation that could be preformed and then implemented in a tournament before Brawl came out, then I would seriously apologize for what I'm about to say:
DON'T WASTE YOUR PRECIOUS TIME! Why spend meaningless hours spent on trying to make a pathetic move awesome? Why doesn't Fox use his fire fox to attack opponents more? Because 9/10 times there isa better move with less risk and more reward. Finding a situation, a purpose, or even a morbid, doubtful idea of a place to try to use her upsmash will probably only result in utter failure. What character wold you use it against? Fast fallers go right through it and nail you. Floaties Di out and come to the same conclusion. The only way that you could possibly make it work is on the other players inability to DI or, in general, play the game. That is not a risk I'm willing to make.
It's not a lot of damage, you are left open for an extreme amount of time, it can be attacked through, it doesn't hit around all at the same time, it doesn't stop a lot of moves, it doesn't combo into much, and its existence alone sometimes gets in the way of an up tilt or up air! The entire move is a blemish on Samus' move set. Why you are even compelled to go on this crusade, if not to fulfill a bet, is foreign to me. Why not spend time working on damage % data for moves, figure out the best time to use certain moves on specific characters? That would be more progressive and help more people. The up smash is a dead move, and by that I mean it leads to YOUR death.