My theory is that a change to ranged ROA is held back because of two things.
1) repeater ROA and Crossbows in general
2) Manyshot may have been rushed into the game and increasing ranged ROA with manyshot as it currently stands would be bad....crossing the streams bad!
Seems like there should be a way to increase the ROA on a specific type of ranged weapon without increasing the ROA for all ranged weapons as a whole. This might allow them to adjust bows up without breaking ranged with repeaters...and possibly tune repeaters down to where they fit thematically.
Manyshot needs to get some serious rework time. As it stands this is a block to ranged combat being changed very much from a mechanics stand point. If it was simply changed to a stance ranged combat would be too good and the devs fears of all ranged combat all the time would come to pass.
(Crazy very rules oriented suggestion)
Seems like if it was changed to a single attack clicky like trip, except with a single round cool down, it would fit with pnp rules and we could then bring ranged ROA up with less fear of power overload. The feat itself provides a set of attack boxes when you take it in your feat section of your character sheet. One symbol with 2 arrows for 2 arrow shots, symbol with 3 arrows for 3 arrow shots and so on and so forth. When you click the symbol you fire a volley of x arrows that the symbol corresponds to. That attack gets the appropriate penalty to attack associated with it. The activation of one works like the boost system and locks out all of the symbols for the cool down. The cool down would be equal to a round of melee combat (5 attacks) ~about 3-5 seconds. If a player wanted to spam the manyshot volley they could but it would be slower then what would be the improved ranged ROA.
Imagine if manyshot worked like deepwood sniper does right now and you could hit it every 5 seconds rather then 10. Would you use it? Would it be worth a better normal ROA?