One of the best features that we have been working on for the next release of Dradis will be an improved Ajax refresh feature.
We have prepared a small screencast to show it. Two different browsers are shown side by side. Notes and nodes added in one browser are replicated in the other.
Dradis 2.8 smart Ajax refresh por etdsoft
It is already in our GitHub repository so you are free to git pull and give it a shot. We will be very interested in hearing what you have to say.