The best replacement for quiver is dual wield.

The best alternatives to quiver are rated as following:
★★★★★  dual wield
★★★★★  dual crossbow
★★★★  tremble
★★★  shield demon hunter
★★★  bow quiver
★★★  hip quiver
★★★  hand crossbow
★★★  holdall
★★  treelimb quiver
★  bow mounted quiver
★  quaver
★  dual wield demon hunter
★  shiver
★  broken arrow
★  tight spot

Your alternative for quiver is not listed? Suggest!
Speaking about quiver, one probably shouldn't forget about hha sight.

Other search terms related to quiver and their ratings are:
★★★★★ hha sight
★★ crossbow diablo 3
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Google Trends

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quiver
dual wield
dual crossbow