Idk, i've been playing ssbm peach for years and use the stick to jump and include the x/y (whichever one is furthestmost right) to hold my float. i was told a little while back that my float cancelling was sick (:D) and idk, i think it gives you more ...experience? being able to control both.

(stick) jump, (stick) down, (button) x/y, (stick) direction, (button) attack, (stick) fastfall, (button) x/y release => followup

i guess thats the stream of doing a FC aerial with peach, and i can do those 1/4second delicious counter ones lol (*'-')

even without the FC mechanics in brawl, i still do it to control the height/speed/range/whatever of my attacks. peach is beastly