As a developer who always is switching between tools in the terrain editor,
it would be great to switch with ease though hotkeys when wanting to select another tool.
There are no hotkeys for these respective buttons yet (but there is 1 to toggle the window)
A better suggestion is to enable those hotkeys once your mouse is hovered over the terrain editor window. How’bout that? 
I strongly support this feature request.
I don’t have to tell you why it’s more productive, but here are some obvious sources that do:
https://blog.codinghorror.com/revisiting-keyboard-vs-the-mouse-pt-1/
support