Personally, I altered the Control Scheme to..
ACD
B
I play Naoto, and I found myself tiring my thumb out very quickly with D at the default position. Plus, it is easier for me to cancel out of sniping stance by having my ring finger holding D than switching over my thumb to pressing/holding D from B. And under this format, there really is no confusion for me in challenge mode displays and hitting all of the buttons combinations you need is still pretty simple. If I ever needed to play on default for whatever reason, it still wouldn't be too awkward to do so.