Custom object brush expansion

Currently, the custom object brush only allows for one selected object to be painted around; With the future addition of multiple object selection, I was hoping it would be possible to instead be able to create object brushes entirely.
Selecting multiple objects on the map or in the menu, individually set their min/max scales, possible rotations, where/how it can be placed (underwater, floating, only on surface), the distribution ratio between each object, and then save the custom brush and possibly being able to share it on the workshop