Re: Is external rudder a good idea?
Or alternatively to make it easier to steer, just balance your rudder some, ie. have some of the rudder forward of the pivot axis. This is the only real reason that they are harder to steer, all (probably?) spade rudders are balanced to some degree which is what makes a tiller steered boat with a spade rudder have a lighter feel.
Weather helm is a product of sail placement, trim, and hull form to some degree. There isn't an inherent reason why a transom hung rudder will display more weather helm, it is just that most of them are not balanced to any real degree so have a harder feel. And they are more susceptible to following seas banging them around but not a whole heck of a lot more.
So KrissKross, if you ever build a new rudder, balance it by putting some of the area forward of the pivot and you'll be amazed how much more lively it feels. Then make it a nice NACA 0012 foil and you'll also be amazed at the low speed responsiveness.