Brad, if I understand your question correctly, the short answer is "maybe". :rolleyes:
First, I'm not an expert so take my opinions for what they are; opinions! Anyway, here goes...
If you cut your riser to center, and then add some shelf/rest material, it will naturally place the arrow slightly left of center (for a right-handed bow). This is good, IMHO. An arrow shelf that's cut past center, where the arrow is perfectly centered, or even pointing off right of center, will be a beast to tune properly.
Now, a bow that's cut close to center (vs. one that's farther away) will shoot a stiffer arrow. In most cases, stiffer means heavier, so that's a good deal for most traditional archers. You can still make a past center or center-cut riser, and then use shelf material to build it out to a point where tuning is easier.
Make any sense? Hope that helped.