wacom eraser shortcut / adobe animate

Hi, i dont know if there is a similar subject but i didnt find it.

I have a specific problem with adobe animate and i try to explain.

in wacom settings you can put "erase" on one of your wacom-pen buttons.

i work so more intuitive for example in photoshop .just draw a line and erase with the button pressed down.

and when you release the eraser button it jumps to brush again.

now i have 2 problems.

if i set up "erase" on one of my wacom pen button it just wont work.

if i keep pressin "E" it doesnt jump back to brush again.

So its kinda really anoying to press all the time "e" than "b" again.

Is anyone out there can help me? 

best regards