Using my older drivers installed on the one outside, I just did a grab with exposure time set down to 0.0001, which probably translates to zero once it's inside the camera, ie it will flush, latch, then download with no delays. This is what came out, it's sitting in full sun.
As you can see, the sun causes terrific blooms, as do a couple of the brighter reflections.
When I was experimenting a couple years ago, I did try grabbing just a few scanlines at a time with that setup, and I was able to get them without much blooming, except for the sun itself being totally wiped out. At the time, my thoughts were, a smart program can look at the exposure, see it's way overexposed and bloomed, then switch to a mode that builds individual frames by doing zero length exposures and just grabbing a few scanlines at a time, then glue them all together into a single frame.
It's on my to-do list, but, it'll be at least a couple weeks before I get that far down into that list.