Only if it's not instant. If it's a gradual thing that takes maybe 10 seconds to change from 200 to 1000 then yes.
it would be like having to set up a convergence on 3 riflemen. it can be done but as soon as they move then the convergence is gone. it's not the same as in a fighter where the mgs are fixed. all the guns in a bomber were free moving, independent of each other, so no convergence was possible. and we are actually lucky we even have one in ah but I guess it is to make it harder to kill them.
adjusting convergence on the fly shoudnt be allowed, just like it isnt allowed in fighters.
semp