That may not be necessary. You may be able to write code that applies a multiplier to the raw sensor value before ADC conversion so that it scales according to your preferences. The LinnStrument (128) has such a feature called Touch Sensor Prescale.
If you are looking to go the Striso route, note that the thickness of material between the sensors and your fingers will matter, as it directly affects the amount of pressure and precision required. This is one reason why I modified my LinnStrument to use bamboo fabric as a playing surface.