Whitelist hits by referrers -- ignore all other referrers

I would like to set up my referrer ignore list as a whitelist rather than a blacklist. Most of my visitors don't specify a referrer, and most of the rest come from a handful of known sites. Then there's a long tail of a myriad ever-changing spam referrers.

So whitelisting the good ones (including no referrer) would be much more convenient than blacklisting the bad ones. However, that would also require that WLE output a list of all views that were deleted because they were not whitelisted since a new good referrer might pop up. If that could be implemented I'd be grateful!