I don't particularly like the idea of @Veto being an @Alternative stereotype, I think it should veto the bean. Also there is not really that much difference between typing @Veto and @Alternative anyway, and @Alternative is clearer as it is part of the spec.

Also implementing @Veto as a stereotype would prevent the bean being specialized in seam-xml, as seam-xml would apply the @Veto stereotype to the configured bean.