I have worked on a system that had issues in 1st stage because it was incorrectly wired to have only 50% airflow, so I wouldn't recommend it.
I do have one customer that has an XL16i that does dehumidification on demand in both stages though.
It took some funky dip switch settings, and a couple of relays spliced into the 16 pin harness to the motor module though.
For a given max airflow setting, there are 16 available airflows in 5% increments from 25% through 100%. The trick is figuring out how to manipulate the inputs to the motor module to take advantage of them all.
Best left to someone who has a full understanding of how the controls work. I wouldn't try to go down that rout with someone who has a hard time getting it wired the way the instructions specify.
Someone that was really sharp with electronics could even build something to interpret the thermostat inputs and directly control the blower with a PWM signal to get the desired airflow for each stage and mode of operation.
I'm not that sharp, so I stick to dip switch settings and relays, and only that one time for a special customer.