I am unsure if perk progression will work
No, perks will not work at all.
I was very unhappy when I found that too. It doesn't make sense to me why my perks are unavaible when I'm in offline mode. From what I know, Steam already holds a local copy of the game statistics using Steamcloud. I'd really like you guys to make KF have a cache of the stats for offline use when Steam's in offline mode.Was the only part of that post intended for you Reap. Perks are on Steam, thus will not be available at all, not just leveling.