Add the ability to change placing key because sometimes when I hold bucket of water and shift to not fall I place it by wrong, I hope you get it, thanks.

Duplicate of #13

This has been released on version 4.1

But 4.1 on version 1.14 isn't it?
I'm playing in 1.12 :)

Please read the FAQ on the subject of backporting features.

Unless someone wants to do a PR to implement this on 1.12, this will not be done