Theoretically we could provide some form on dual touch in resistive 4-wire, but I wonder what it's worth when none of the Qt/Hildon/whatnot bits and none of the apps and none of the original N900 can support it. It's not like we introduce a completely new sensor here like e.g. compass that you could build apps on, touchscreen/pointer/HID is deeply entangled with X11 and hildon desktop and the whole gtk/Qt/other-toolkits. We will have a look into what can be done with minimal effort. We probably won't change the chip though. Maybe some hw hack (my hobby ;-D )

/j