Can we buff Twitch's invisibility?

6 seconds is too much, should be about 3 seconds in my eyes, double the amount out of combat. Even 1.5 seconds feels like an eternity in game. At level 1, it takes 6 seconds in combat for only 4 seconds of invisibility. I get that Twitch shouldn't be able to just dissapear whenever he gets caught but right now it's pretty lame. I know that it's called Ambush and that it's not really for escapes but without an escape Twitch just really isn't that good. He doesn't have the slows to kite like Ashe or the extra MS like MF. Look at Tristana, sure she doesn't have the great teamfight ultimate that Twitch has but she has a massive damage multi target knockback, good for an escape, or a disengage for the entire team, this is in addition to her massive leap.