Actually, I think everyone in here missed what I was trying to explain, probably because I wasn't explicit enough.
My stick button layout is:
A B K B
G A G B
The reason I set it up this way initially was so I could ag:B easily by sliding my finger along the bottom row (the AGB part). As you can see, this setup happens to afford me two A buttons fairly close together. The idea that occurred to me, and what I've started doing, is hitting the two A buttons simultaneously (or nearly simultaneously) while entering my 1A: A: A input. My index finger hits the A on the top row, and at almost the exact same time, my middle finger hits the A on the bottom row.
I kind of assumed a certain level of SF knowledge here when I was explaining before. In previous Street Fighter games (it's easier now), performing a special move as a "reversal" (say, in a wakeup situation) could be difficult to time perfectly. You would do a DP+P, but if you didn't time it perfectly (reversal timing) you could be interrupted. A trick you could do was do a DP+P~P~P by "drumming" your fingers (or pianoing, or rolling) across all three punches. This way you were literally three times as likely to hit the timing window, even if you couldn't necessarily predict what strength of DP would come out.
This is the same idea for how I'm using this technique. It is also why by top row button layout is now "ABKB". I use the two Bs simultaneously (using my index and ringer finger) to make the 1B:B JF easier. I started seeing results with that right away, as when it first occurred to me to try it, I hit 1B:B, 1B:B 4 times in a row with ease.
