Shift + Click to pour a fraction of holding substance

[gravesmerch]

ex: holding a bucket with 5L rennet, Shift+Click other containers would pour 1L instead of everything

could work with other substances too, but liquids are missing this

[kortigus]

Either this or, if they want to maintain a level of RP or immersion, measuring cups of various sizes.
That would be pretty nice to have.