since manyshot will give giving a -100% doubleshot for 70 second after update. there should be an update to doubleshoot to compensate the penalty. doubleshot bonus from shadow arrow and aa capstone should be doubled. (10% and 20% total of 30%)
archer dps is purely depend on manyshot.. if you put a penalty to it, then perhaps update their normal dps. so we can save manyshot only for the most needed time.
p.s. 10k star is just as powerful.. why manyshot have way longer debuff time??? 10k star may not be as much burst as manyshot without decent equipment(mostly wisdom), but it's cooldown is only 1/4 of manyshot..