Fast Filling the Hot Bar with Lava.

Working with Lava is frustrating, because you can only place nine buckets, and then you have to clear your hotbar and shift click each of nine more lava buckets into your hot bar: shift clicking and double clicking move lava buckets to the top of the inventory, (out of the hot bar) and it'd be nice if there was a way to move them into the hot bar with, or if that feature already exists, it'd be nice if like so many other unmentioned features, it were included in an official 'small mechanics' tutorial to learn this stuff from.

Ideally, this would also work with water buckets, but water buckets form infinite sources so that's less important.