I'm having a hard time crafting my nesting materials since I got heaps of items, so I'm here to suggest:

-that a bulk crafting option is available (like when you sell your items in bulk to the monkey but in this case you could select, for example, a bulk of 10 white lion pelts);

-and it could be possible to craft multiple nesting materials at the same time according to the amount of items you selected (example: 72 Honey Bush, each one has 2 uses, 2x72/6=24 materials crafted)

p.s.: this should work with every kind of item (feathers, herbs, pelts), making it possible to mix bulks, like selecting 2 Glossy Ibis Feather, 4 Nut Grass and 6 Aardwolf Tails

This is possibly very helpful for mass breeders, so I'll leave it here and see what you guys think of it