I’ve had a few situations where I’ve allocated my first 3-bands of PEQ, but was unable to make use of the remaining band, because of the sweep limits.
I would love (love love) it if all PEQ bands were fully flexible and could go anywhere across the spectrum.
Happy to retain the confines of the LF/HF Pass/shelf functions, but full sweep-ability would be rad!
Have you ever tried to check the PEQ options? As far as I understand the manual you can set the frequency range for each channel individually or global for all channels.
You will find this is an option. Hold the option button in the lower left of the screen when a EQ is viewable. You will see a gear. Options allows for output and input EQs to not have limits.