The Supplementaries mod adds a quiver that sort of acts like a bundle specifically for arrows. According to the dev of that mod, the quiver is also based off of the vanilla bundle code.
with this in mind, would it be possible to carry over the feature mousetweaks adds to bundles, where you can hold right-click while dragging them to pick up multiple items at once?

I guess I can see when Supplementaries updates to the latest Minecraft version.