The probability and randomness settings affect an entire sequencer currently, which is fine but far from being really usable.
A lot of manufacturers have integrated probability per step, which allow you dial in the percentage of chances that a specific step will trigger.
Elektron has that in their drum sequencer Digitakt, and a bunch of modular sequencer have that functionality too.
This allows you to define a sequence for which some of the steps you choose won't trigger each time.
I think it is much more useful as you can create controlled variations on a sequence, it's not just completely random, it's whatever you choose.
Hope people will agree that this is something that should make its way to the beatstep pro,!
thanks