Forgot password - simpler token

When the ‘forgot password’ function is used in the webGUI, a token as shown below is sent to the user by mail.

This token is probably very safe, but also difficult to copy in handwriting (correctly), and the safety it provides is does not reflect the functions Zeeman provides to most users. 

Therefore, an option to configure a shorter/simpler token would be handy.

I was thinking of a 4 digit numeric code, but a 6 digit code (provided by the forgot password function in the mobile GUI) would also be ok.