How to view the Image while changing settings?

when taking photos, how do i make my Lumix G2 preview the changes in ISO on the screen, i can do this with Aperture and Shutter but how come i cant with ISO changes? and is there anyway to make the SHTR SPEED EFFECT default to ON or OFF, so i wont have to switch the trashcan button then display button to preview what the image is going to look like before taking the shot?
 
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