Yes you can dry-steer on the road test in BC and driver examiners generally do not care about it
(it is your car you are using for the road test after all; ICBC doesn’t care if you wreck your own vehicle!).
Dry steering (steering while the vehicle is completely stopped) is hard on the vehicle (tires) and steering components and may lead to costly repairs if done repeatedly. Generally it is recommended to avoid dry steering altogether. However, if it makes your life easier on the road test, then go for it – dry steering once or twice will not cause anyone to burst into flames.