Just a suggestion:
In Custom Edit Mode, while adding item on surface, would be useful to be able to scale it with hold-drag LMB.
As currently I'm placing some trees and have to do following operations: 1) Add new item 2) Exit "Add" mode. 3) Select and Scale object 4) Go back into "Add" mode.
The much faster way would be: 1) Click-Hold to Add and Scale