Hi. I'm online and happy to answer your question today.
There is still no way to surgically do a partial correction for crossed eyes....sorry about that :(
Over correction doesn't occur on every case for crossed eyes, but it is a risk in every procedure. Of course, if there is over (or under) correction, a second surgery can be done to correct this issue. Usually a second surgery gets it "right" but not always. Also, if you don't have very good vision in your "weak" eye, you have a very high chance of your eyes crossing again, even if the surgery was successful.
Sorry that I can't tell you that a new miracle surgery has been developed since the last time you checked but, hey, you never know......
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