Yep, I've been running it for a few minutes with the cap off, having a helper hold the RPMs up while I squeeze the top tube a few times. Once it wouldn't take more, ran it around the block a few times, let it cool and topped off a little bit more.

This was a dream, the last 2 times I had the system open, bleeding it was this dance of alternating elevating both ends of the car, squeezing hoses all over, and adding what seemed like teaspoons at a time. With the mod I had it bled in 15 minutes and it was ready to drive!