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Okay tested it. Support for the wbr tag came with html5 so it is part of epub3.
So I tried your test using epub3 and the <wbr /> tag and it nicely passes current EpubCheck.
Is there some reason you are still building new epubs as epub 2.0 versions?
Epub3 is the current valid epub spec and epub2 is now considered deprecated at best and by many to be obsolete. Epub3 can be made backwards compatible to work with older epub2 only e-readers. It is the leading epub format especially internationally. Epub3 is also a preferred format when converting an epub for the kindle.
There seems to be some resistance to moving to epub3 from some people on this site, but epub3 really is the right target to future proof any epub you are making.
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