You are doing something wrong. My k-x in manual AEB changes SHUTTER only when in manual bracketing.
In Av mode with no auto-ISO, it does the same, only SHUTTER changes.
So the problem is you. If you bothered to read the menu, I'm sure you'd find out:
Menu - Green button setting - Action in M mode - Av or Tv shift. Tv shift will set it to change shutter only. Av shift will set it to change Aperture only.
Before knocking on a camera manufacturer for being "stupid" or implementing a feature in a camera and calling it a "poor design", maybe you should really learn how to use the camera properly first.
Last edited by JinDesu; 08-05-2012 at 11:03 AM.