We particularly liked how the Function button works in concert with the LCD panel, which indicates which dial sets what function. However, if you accidentally both hit the Function button and turn the rear dial, you could dial in an unwanted exposure compensation. Your only warning will be a tiny plus or minus in the viewfinder. For greater control, press angled Function button, then turn dials. Simply hold in AE lock button, turn main control dial until setting you want shows in finder.
All settings change simultaneously to maintain proper exposure.
Lens zooms out to proper focal length just before shutter fires. Yes, with moderate-speed subjects. 9xi lacks handy, built-in flash of 7xi because, Minolta claims, flashless body is stronger. Controls are moisture, dust resistant, back seals upgraded.