MEDIABAY: Ability to addendum edit fields Right-Click/'Add To'

Hey I would like to be able to add to edit multiple fields at once and add, for example keywords, without unifying their fields.

For example, if I have multiple kick drums, and they all have different ‘Character’ attributes, I want to be able to ‘Add To’ Character Attribute: ‘Distortion’ without unifying the rest of the character attributes.

Or if I want to add keywords to multiple fields without unifying.