Martin,
I’m not sure there is a way to do it natively within InDesign, but if you know a little HTML & CSS and feel comfortable unzipping and rezipping the file, you can always wrap your table in a div with a class that has the attribute page-break-inside:avoid; I can’t say it’s perfect but I’ve had fairly good results with it in the past.
That said, this type of thing is the nature of reflowable ebooks, things break across pages that sometimes you just can’t control like you can in print. And since your readers can change variables on the page such as text sizes, margins, and leading on their ereaders, sometimes you just have to throw up your hands and say “good enough.”
Aaron
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