Lets start with letting people know the 2 type of build on archer class. the STR/DEX and the SPR (nope don’t make it complicated STR/DEX is for STR and DEX or both)
First there is always 4 skill being present on archer classes type… and lets get to the point. skill that have no cooldown are for SPR and those who has cooldown are most likely for STR/DEX (you can even tell by looking at the attack damage most of the no cooldown has much more attack damage than those with cooldown)
there is a mechanics to that… those who has no cooldown has high mana cost which make it hard for STR/DEX to spam it or they will deplete their mana in no time.
while on the other hand those skills that has cooldown can not be spam by an SPR coz of course there is cooldown …duh… 
but we really need to reduce the cooldown of it (reduce not remove or else SPR type will be the only build left to do.) and we can not let the SPR type to be part of this decrease cooldown coz they will for sure utilize it and there will be unbalance on that part.
my suggestion was to add skill attribute on archer classes
Strength and Dexterity Mastery
reduce cooldown by 1% per attribute for every 30 stats of STR and DEX [will not go higher than 70% only works for missile type skills] (max level: 10)
on level 10 it would be 10% for every 30 stats of STR and DEX
Feel free to leave your suggestion and advice on this idea for reducing cooldown for STR/DEX type. this was a quick equation so opinions are needed coz this reduced cooldown may get overpower on higher level for some skill such as Full Draw
.