It doesn't take much to kick them up and down so try it an get use to it. I noticed in the Austrailan hobie cat nationals the only people who left their rudders down where the people at the end of the race course, all th top guys were doing it. Well I also noticed the french guys also do it and they are preety decent sailors to be beating some tigers around the track. I think it comes down to the type of boat which it works on and the hobies need it. In terms of having a hull flying, the rudders should be in the water since its faster to sail with the hull just skimming.
Jules