Haven't had coffee yet, so I hope this makes sense. Also, I'm most likely going to go back to dual-weieding, even though it gives me less damage, simply because it feels "right" for my character. (I mean, come on; he's a rogue.)
@Pateu, I don't know about Rally and haste, but Bard songs, yup. I'm playing on 360, so I don't know if that works on the PC, but I imagine it does.
@Mike3207, Nope. No Intensify runes. BUT, I had some stuff equipped that doesn't import when I imported my warden, to take advantage of the bug that makes the bonuses permanent even though the equipment doesn't transfer. I'll have to go back and look at exactly what items had what bonuses, but off the top of my head, Starfang and Dead Thaig Shanker (which I have heard is supposed to import, but apparently does not--at least on console--if you have it equipped at the time). And of course, VoV contributes.
Also had shadow form on, which I believe gives me a bonus to crit rate? (Obviously I couldn't use any of my dual-wield skills.) Then there are the bonuses from equipment, of course, but yeah, most of the boost from the 30s to the 70s seems to be from buffs. I have Anders doing his "reduce fatigue cost" thing (which helps everyone maintain multiple effects at once), and my character, Sigrun, and Nathaniel all doing Song of Courage. I gave both of them just enough Dex (52) to get all their archer skills, then pumped everything else into Cunning, since Song of Courage's effectiveness is based on Cunning.
I'll look at my origins save and see what I had equipped, then at my rogue as he currently is, so I can be more accurate with it. (Might take pics of the screen to avoid having to type it all out.)
Anyway, it was basically just a case of, "Hey, what happens if I do... THIS?" And then me looking at the screen like whoa, I've created a monster.
And even though I plan to finish by dual-wielding, now I'm curious to see just how far I can push it while still keeping the other characters viable. (I mean, obviously I could pump up the crit rate and damage even higher if I were to forgo everything but Cunning for my other two rogues, but that would make them nearly useless except for buffs, and if would be a little boring if most fights I could end by doing flicker once.)