this is the first time i'm reading that reesistive screens can support real multitouch?!
if thats so, how come there are no devices with resistive screen that do multitouch like devices with capacitive screens?

when you push on 2 positions on a resistive screen, your effective pushed position is right between those 2 points. like its creating an average value of all points pushed.

also, holding one finger down to activate zoom and then pan up/down to zoom has already been done by samsung (look for samsung jet)