haha... funny guy!
Actually, this may not be a bad thing to add.  Usually the things that slow down the forum are the ones that are on every page load, or on the read only pages.   A spell checker (which I sorely need) would only show on the reply pages.
Let me look into it.  In the mean time, look at IeSpell for spell checking online.  I use it with IE and it is a life saver!