This isn't a customization issue - this is a capabilities issue.
For the mystore template, when I use any other setting than "template" for the module style, the ImageShow has errors. With the thumbnails setting, only the first image shows up. With the Image rotator setting, I lose the text block.
I've tried multiple reinstalls of quickstart with the same result.
I've been through the helpfile.
Is this template not capable of using a different module style?