Most people definately don't play kicks count as part of bank pool, even short rack bank pool.
I think they instituted that at the DCC Bank Ring Game to try and help speed things up. Three or more rail kicks counted as a bank.
I personnally don't like counting kicks as banks, and I play a fair amount of three cushion. It would actually be to my advantage most of the time, but it cheapens the game of bank pool, IMO.
I do think kick banks should count, though. If you can make a clean bank after hitting a rail first, which takes a hell of an accurate hit, it seems fair to count it.