There might be a reason then to use the top air brake portion. Dunno of course until someone does, but the top side air brake piece should induce a good deal more drag. However, one person's flying style or feel for the plane might not translate to everyone. Case in point, a friend of mine likes to fly his planes with little expo on any of the surfaces, however, I prefer to have about 50% expo.
Someone might think the landing speed it too fast on one plane while another person is comfortable with the same speed.
So, unless Ramstein were to make the airbrakes functional, there's no way for him to know if it would help or hinder HIS comfort level as it relates to how he is used to doing things.

I am waiting on another light kit and as such, I havent worked on my wing for that reason. The light kit I have has landing lights and the real plane did not, so, Im not expecting to get the wing finished for another 2 weeks or so(unless the light kit showed up today). Who knows. It should have been here already, but, coming from Honk Kong, sometimes packages take forever and sometimes they arrive within a week. Its already been 2 weeks almost.