It would be great to address it now that throw/some bow builds aren’t meant to be the fringe efforts they once were up until 2.4. Seeing as the community appears to be split on this, I think this would be a great solution that miiiiight pleases both groups.
- Replenish quantity is added by default to the player as a Stat that is viewable on the additional tab. Call it replenishQRate, madawcGonnaHateRate, mercCaddyOP, anything.
- Inhale Replenish Rate references your current total attack speed/throw speed (breakpoints?), checked at each game “tick”. A quantity increase is then applied to your weapons in each equipped set, at a rate of, say, +0.25 quantity, replenished at your current Attack/Throw Speed. The quantity replenishment can be displayed by whatever rate metric (per tick, per second, per tantrum, etc). This way you can deplete your quantity in a drawn-out battle where the arrows and axes are REALLY flying, but with some short downtime or pacing, you’re guaranteed to recover at rate that should be manageable.
- Weapon retains the classic durability loss notification icons.
- drumroll When your equipped weapon hits 0 Quantity, the replenish rate is disabled until repaired, so be careful with those Ethereal weapons.
- Repairing can still replenish quantity if needed, but it costs the full quantity amount until the quantity reaches full.
- Revert the Quantity increases. Big numbers can be fun, but let’s save those for those sweet, sweet damage listings.
- Built-in Quantity stacks can be scaled to represent heavy lobbing or rapid consumption designs on a per-weapon basis for current and future weapons. The proposed replenish rate stat takes care of the rest.
The rate itself would be automatic, and not necessary to monitor, however, with replenishment being based off of current attack speed and quantities being displayed on the Skill Bar, it becomes much more of “feel” thing with convenient visual feedback. Just be sure to not bottom-out mid-battle, especially with those fancy Ethereal weapons 
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Shameless Wish List Warning
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Normal, Exceptional, and Elite Arrow Quivers with select Magic/Rare/Crafted prefixes and suffixes, and (gasp)… Ethereal and Unique variants that tacks on some amount of minor damage
? Sacrificing a Shield could feel even better. -
Socketable Throwing Weapons with possible Runeword applications. Ok, I’ll stop.