nah, I know how to keep dimensional proportion. All I want to do is pull it from the center because honestly it is a much better way to pull a circle. Say you want to have a circle one size, and then another that is just slightly bigger in radius around it. You could pull one, maybe even from a corner, position it where you want, but it is more of a hassle to get that delta-radius that you want if you can't pull the other from the same center point. You keep having to re-pull if the size is slightly bigger or smaller than you want. Then to try and pull a third circle with the same delta radius would take longer.
I know its nit picking but you can do it in so many other types of programs like for modeling or drafting. | 
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