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The only other annoying thing about the MBP in Windows is a lack of tap-to-click, although I suspect this is a driver issue

Try these Synaptic Drivers? Haven't actually used them myself yet but they are definitely worth a try.

Also Re: the 3 button issue, I ran Linux on my Macbook for quite a while and had single finger tap = left click, two finger tap = right click, three finger tap = middle click setup. Sounds dorky but worked well. Now recently reinstalled I have OS X, XP and Ubuntu (+ Compiz Fusion) on there with a pretty graphical boot menu. I just can't decide what OS to use!
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Hussein