I was creating a series of per-user MSIs that would not require elevation on Vista, and the WixUI dialogs displayed elevation shields on the Install, Change and Remove buttons even though my MSIs didn't need elevation.
Looking at the source .wxs files for WixUI - there is not a way to customize the WixUI dialogs to cause them to not show the elevation shield in per-user scenarios without copying and pasting the source and replacing the dialog sets in my MSI authoring.
WixUI should include conditional logic to not display the install shield during per-user installs on Vista.
I'm working on a fix for this already, but wanted to log a bug to track the issue in the meantime.
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