IIRC there is a physical lock in the flight deck which is really only to stop the control column flapping around. I don't remember how they worked but there are gust dampers actually in the elevator but the whole things still moves around in the wind (assuming the RJX has the same system, although I did do the RJX type rating ground school bit it was a long time ago).
Not much you can do short of sticking some rubber stoppers in.