Setting range for expression pedal controlled parameters?

Hi, am I missing something or is it not possible to set a specific range when controlling parameters by expression pedal?

For example, I would like to assign the expression pedal to volume, but most of the volume controls go from attenuating (minus dB) to boosting (plus dB). So when assigned to the expression pedal, I end up boosting and clipping the output when pressing the pedal toe-down.

In another example, let’s say you want to blend-in post effects by assigning the expression pedal to the mix parameter of the effect but you don’t want to go to 100% mix when the pedal is fully toe-down.

Can this be done? If not, it would be a useful feature for upcoming updates.