I don't have a Lensbaby but I think I understand the issue. Your choices are Av or M. (Or B, if you're shooting dark and long). Ira would say, M every time. Someone else would say, Av every time. I'd say, whatever works. Av probably gives you less to worry about as you shoot.
NOTE: A similar issue arises with full-circle fisheye lenses, or such adapters on other lenses. Matrix or weighted metering might include the black margins, throwing off the exposure in the lit circle. I need to adjust EV then. You may need to do the same if you use your Lensbaby to achieve vignetting.
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