Using current git and a fresh profile ( ie rm -rf ~/.e && startx ) I can't add a bryce to a secondary display. The wizard runs on the 2nd display, where I initiate it, but then the bryce appears on the primary display.
Sorry for the delay. This started working for me again, as of a build this morning. I've checked your branch ( above ) and it's also working for me. I'm therefore setting this as 'resolved'.