for the pinch to zoom to work your /system/csc/feature.xml file must include the following line
<CscFeature_Sip_DisablePinchZoomInOutTriggerForOndhandOperation>false</CscFeature_Sip_DisablePinchZoomInOutTriggerForOndhandOperation>
some providers... like Verizon..... set that to true for some...