Oh no, I didn't miss it, I used the word "haste" in my post (admittedly I did use "speed" first). It's the same type of buff as Presence of Mind or the old Arrow/Scholar fairy haste (and RoF's slow), so it does apply to autoattacks but does not have an effect on DoT tick damage like Skill/Spellspeed do.
Still, even if you squeeze out one more autoattack during that RoF opener (which is possible, if unlikely) it still wouldn't outweigh the 3% bonus general damage under it. But yes, after that opener you sit in FoW for the rest of the fight. Really the biggest advantage comes from the slight rotational tweak where you use True Strike twice per Twin Snakes (requires just under 1300 skillspeed to do.) This is a pretty nice rotation that was possible back in HW, but TP limitations at the time kept it from being especially good.