I have an archer.
He has PD 6. This is the top limit any archer needs.
He has 150 wpf in archery.
He has very good K/D ratio.
I can post some screenshots if you want. Top of the tables, scores of 12/2, etc.....
SO: I can fire accurately as far as the game can render. I can kill ANYTHING with a single headshot. My 18 strengh allows me to destroy others in melee with basic weapons. I dont wear armour, or carry a shield.
WHY ON EARTH would you want to compare Warband (a great and innovative game) with GW (another cloned rpg where I press 1, then 2, then 3, then space bar, then 4, then 1, etc)??!!
GW sux my ass, its just another point and clickfest.
In CRPG, If I want fast fire and supperaccuracy, I grab my shortbow, if I want to dominate tincans, I grab my 'loomed warbow. When Im riding my horse I grab my Strongbow, or to save money my nomad bow..... On my agiarcher I always have my Hunting Bow to hand....
I read the OP, but the OP obviously hasnt played the game, or else he would see that there isnt a gradual progression, if you are seriously going to build an archer, the only realistic way to do it is use melee weapons untill 18 str........
PD over the requirement DOES NOT GIVE more accuracy, it merely allows you to hold the bow drawn for longer without suffering penalties. This can be helpful if you are fail at aiming, or cant pick a target.
Archery does need SOME love IMHO, but the OP's idea has not been thought out. BAD IDEA, if you want to change something, try to improve or innovate, dont just try to clone the style of another game, especially not so stagnant and downright BORING as GW.