Interesting reason noted in the original post. Mouse hovering is important to many sites. But I see an easy workaround. A multi-touch device could be set to always hover the mouse if two fingers are pressed on the screen (say any finger from your off-hand).
Heck, I already do something similar frequently with a regular keyboard and mouse -- Control & Left mouse drag to copy something in many Microsoft applications. Or Shift & Left mouse drag to "pan" in Adobe Photoshop.
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