just to be clear, i'd like to keep my dock and circles on the same side (left). but i'd like to be able to vertically move the circles "pad" (not sure what you call it) vertically along the edge, freely, to the position that suits me. i've got a couple of inches both above and below my dock that are unused, and presently, i'm constantly invoking circles when i didn't mean to.
(on a related note, after the circles themselves (not just the half-circle launch pad) appear (often by mistake) and then retract, it takes too long for the half-circle launch pad to disappear. it thinks i want to interact with it, when in fact i'm trying to get to icons on my dock! so, i have to force myself to wait for it to go away completely before i can attempt accessing a dock icon again.)
circles are great; they just need some fine-tuning. :-)