Hard edge in lasso mode inpainting?

Loving the plugin. But I'm having an issue with lasso mode inpainting. I always get a hard edge on the rectangular area surrounding the masked area, no matter what I set the mask blur, mask expansion, or inpaint padding. The lasso mask seems to run into the hard rectangular edge surrounding it. This isn't a problem in regular inpainting mode, as you can set the rectangular area to be relatively bigger than the masked area. Is there a way to control how much bigger the rectangular area is than the lasso mask?