Taliyahs W should be click-drag, not click-pause-click

It's one of the jankiest unusable abilities in league.

Yeah, the way it is now is incredibly unintuitive.

the Developer of taliyah stated that her W will never be vector cast

I am not that sure of that.

Primarily because is a delayed ability, and a click-and-drag paradigm might play foul with that (given that the other two similar skills are instant).

Also, you would lose the ability of doing a simple knock-up (or would require additional tech and muddle the use of click-and-drag skillshots).

I often find myself clicking once and then seeing the arrow wiggle around as I try to do other stuff before actually doing the second click and then I end up clicking the wrong direction.

Not sure what you mean by the pause, you can click twice quickly to set the direction cast well in advance

My 2 cents on it.. even tho i don't condone people complaining just to complain.. using this skill has been very sporadic usually involving me knocking the enemy some place i didnt want to cause i always forget to press E a second time. or Left Click.... dismissing it as something i'll have to get used to is silly.... Honestly It's very annoying... only time i knock someone up is when i never wanted to do so....