I believe that EMC let's you map the leadscrew so that it can constantly adjust to compensate for the screws innacurracies.
With your way, you could move another 4" and be off twice what you were before you "compensated". That +/- .004 can be anywhere on that foot, and it can be different from 1 foot to the next. You should be good for that 4" section, but all bets are off for anywhere else. But you'd really have to do a lot of checking to be sure.