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First I've heard of any balance issues. I have a Canon 450D and Baader Coma Corrector on my focuser, with a guide scope mounted amidship and don't have any trouble with balance. I use a NEQ6Pro, and the scope is 8" Imaging Newt (f/5 @ 1000mm fl). The weight distribution usually sees it sitting in the middle of the dovetail. I did swap out the stock short dovetail bar for a long one so I could space the rings as far apart as practical. The guidescope and camera are mounted on another dovetail bar on the top of the rings, this helps stiffen up the whole structure.
I check the mount balance each time I setup, and adjust if necessary for neutral balance point in both axis. I have not had to use any additional weights anywhere, just the standard counterweights on the shaft.
However, if you had a much larger newt, like a 12" then I would imagine that the weight of the primary might start to impact the balance point, at least to the point where you might have to slide the tube in the rings.
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