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Same thing works for me on N8.with me it has worked many times by long touching that place which needs a mouse hover, and the slightly sliding my finger aside instead of lifting it up at that very place i touched the screen.
try it. might help.
Unfortunately for a lot of sites it's just broken, there are plenty of threads out there covering this topic. For instance, walmart.com does not work with WP8 IE. Those sites are coded for webkit browsers and they allow you to mouseover and keep the menu open so you can click on it using kind of a hack. MS has stated before websites should get rid of mouseovers since there is no pointer/mouse in touch computing.