Shadowdancer Shadowform -- clarifications?

[Bjond]

The "Shadowform" description is rather ambiguous about the "strength damage". Here's the text (from the wiki):

Shadow Form: Active Ability: (Cooldown: 1 minute) Spend a shadow charge to gain 25% incorporeal miss chance (and ignore incorporeal miss chance of targets), float as if affected by Feather Fall, have bonuses to Hide and Move Silently (testing shows +20 to both) and deal strength damage on all melee and ranged attacks. You also take double damage from light effects. You can retain +1 maximum Shadow Charges. This is a toggled ability that persists until toggled off or leaving a quest.

The in-game description resolved some confusion -- "attacks" should be "critical hits". However, I'm still confused about what it means by "strength damage". My instinct says "STR modifier is added on critical post-multiplier". However, it could mean exactly what it says and be adding your total STR on critical, though that seems excessive. I could see modifier pre-multiplier, too. And, I'm assuming the extra STR damage is done in addition to regular modifier damage rather than replacing it. Could someone clear this up for me?

Oh, and any tips for what to take in the feat for a VKF Warlock that's just capping it to unlock feats and arcane sphere? I absolutely despise active abilities (great in PnP, horrid in cRPG). So unless it's amazing or required to unlock something amazing, I'd skip them and/or not even put them on the bar. The only slightly interesting ones were executioner's and shadow-form. I hate the shadow-charge requirement. It looks like I'd only have to farm up one charge to activate form, but that's still 3 new buttons I already don't have space for (mark, form, exec).

[vryxnr]

I will have to test to confirm, but my understanding was that critical hits damage (reduce) your enemies strength score.

[Bjond]

I will have to test to confirm, but my understanding was that critical hits damage (reduce) your enemies strength score.

Ah, it's that kind of strength damage! Makes sense. There's really nothing much at all in the tree for non-sneaking classes, but still couldn't quite see such a whopper of a damage increase + defensive all in a single enhancement selection. Ability damage makes sense from the roguish nature of the tree, too.

Thanks for the clarification!