i had this idea about the B-4.
infanry sqauds once the B-4 is build can drop a flare(like UKF sections)
these flares will not callin a B-4 barrage BUT make the B-4 fire accurately where you drop the flare(to hammer specific targets to do a counter attack)
these way we give it the accuracy it needs BUT with counterplay.
that's actually a good idea. the problem with the brit base artillery is that it's hard to get into range against things it's actually usable against. the b4 also has HUGE scatter on the standard shot (about a screen if you're aiming at the center) but it was way to strong with precision shot for obvious reasons.