like you'll shield stop just to jump onto a platform for the shield drop? i feel like that'd be a great defensive maneuver, but only in really specific situations. micro positioning is a more common use for it i think. i'm practicing doing it into bairs, uairs and dairs for the most part.
http://www.twitch.tv/pewpewu/c/4779579
i never do it that way, but i should start incorporating it into my play for more options on platforms. doing a dash into a shield drop sounds pretty useful, but i never see people do it that way very often.
i'll typically shield drop from a stationary position. if i'm waiting for my opponent to go somewhere, i'll do it the arizona way. if i need to get it off real fast i'll just press down on the control stick from shield hella lightly.
also while on the subject, i talked to a sheik from montreal called popo at a local the other day. he said kage had an anti shield drop technique that was developed in response to several of the better players in the region learning to shield drop. he didn't really do a very good job of explaining it, but he made it sound like you simply shield grab someone trying to shield drop. idk but it'd be cool if kage expanded upon this.