We will get back to you on the question 1.
Regarding question 2, yes your understanding is right. The ADC results will be spread over this range. But the input range of ADC cannot exceed the input range of the PSoC device. For a 3.6V VDDA max, this will be maximum voltage the PSoC device can support. So this is the maximum range of input for the device. You might not be able use the complete range for a Vref of 3.3V For a lesser reference voltage, you should be able use the ADC on complete range.