I agree with DBCHERRY here, most of my planes have split elevator and do have some play (my spit has the worst amount)

but it all depends on HOW MUCH play you are having i usually find (tested this myself) that once the elevator is actually operating it takes up the slack and you wouldn't really notice.

in flight i have never had any problems (in-fact the spit is more responsive to elevator)

although i would have thought the larger you control surfaces the more apparent it would be in-flight, i have noooooooo experience here as im not a 3D pilot so better wait for the experts on this one

how you guys do all that hovering stuff ill never know i stick with scale sports jobs i feel safe there