Sounds good to me, with two things to consider:

1. It might be better to organize the skipped features as hash rather than a collection.
1. The map renderer is probably a better place to keep the hash than the map.

@tonio How long until you get your branch merged? I need this issue here addressed as quickly as possible, because we have clients depend on it. So if it's not today or tomorrow, I'd rather get a "go" for this now and change it later to suit your skip features work.