Tell me one thing ... how often is Pindleskin NOT immune to cold when you kill him?

You Tell me, please.

No need, go play more and experience it yourself, so far some of your advice is speculation in comparison to actual facts playing the build.

I mean, wtf is up with using Insight on a Merc and a Berserk Barb more useful than using Pride on the Merc? Damn, how much mana does a barb use when using Berserk skill?

Teleport Costa Mana too.

I'm playing as a thrower/horker and for general play Ravenfrost cold damage is problematic. Fortunately the D2R runeword Wisdom fits the bill nicely - CBF in a helm along with piercing attack and mana leech.

Depends where you run though, Pits isn't so bad due to half the monsters being cold immune. Pindle, Chaos, Ancient Tunnels, I would personally not run these places wearing Ravenfrost. The dex/AR loss is noticeable though