Scaling the sprite, but leaving the spacing between them should work great! :)
As for the alignment or the sprite, I am already aligning the layouter object to be center, it is the collected sprites that is not centering (they are just off center, it is really weird). It easiest to see when there is just one sprite that draws, multiple sprites (ie 2 or more) seem to center much better. When just one is there, it appears that it is aligning the 'left side of the sprite' to the center (of the layouter), not the 'center of the sprite'. I hope that makes sense.
I guess I was thinking if we could have the sprite align to the origin point (or any image point) it would be easier to do just that (basically just put the image point at the center of your sprite). This could open up all sorts of neat alignment tricks potentially.
Thanks again! You are too awesome! This plugin is just great, just like all your other work! :)