Pretty much all RV's have some amount of right rudder trim added.
If they don't, it is not because the build did such a fine job, it is because there are other trimming influences built into the airplane that are causing a right yawing tendency that adds what is needed.
Offsetting the vertical stab can get the same result as a rudder trim tab or wedge (I offset the vertical stab. on my personal RV-6A so it has no rudder trim tab). Keep in mind that to get enough trimming influence, you need to move the stab enough that you will have to totally redo (I.E., make a custom one) the aft empenage fairing. Not really worth the effort.
Any opinions expressed in this message are my own and not necessarily those of my employer.
RV-6A (aka "Junkyard Special ")