I would love to see us gain the ability to dry herbs. Once dried they could either be used directly in cooking (Quality/FEP change?), or they could be ground in a quern. Grinding them in a quern would provide ground (herb), which could then be stored in an herb shaker. Herb jars are essentially like pepper shakers, and give us the ability to do two things.
1 - A "use" of the herb from the jar would be consumed when preparing foods that can be spiced, resulting in the normal effect.
2 - The herb can now be applied to foods to gain its effect, even when it's not normally able to be added as an ingredient. Adding AGI to a meal with dried Chive, for instance.
The original thought was really just a way to condense a cupboard of herbs down into a compact space. Even if that means 5 or 6 herb shakers. But being able to use them like pepper would be good too.