Accuracy does not affect indirect fire - only direct fire. Thus of no use for simulating laser guided or GPS indirect fires.
Use a GPS equipped FOO (with TI or GSR) and a laser range-finder with LOS on the target and your indirect fires will be rather accurate. Part of that technology 'package' could be rationalised as the use of LGM, where appropriate.
Fair enough, I always thought it did, becuase a rocket rife mission will scatter everywhere, whereas if you use a howitzer it is 0-3 hex deviation only. I assume that is becuase of weapon class ?