It is good the Biab Plugin is simple for DAW ONLY users that have never used Biab or didn't want to use it because of the steep learning curve.
I think it would be best kept simple and if you need all the functions of the main app then adding Rewire would be a better way to go and you would be getting your 3-4 secs generate times, so it would have an option as it does now to be "Always On Top" in DAW Plugin mode in the Rewire mode.