Feature Request: Vacuum speed and water box control slider change to off|Low|Mid|High
Thanks for the awesome work! 
I'm just wondering if it's possible to change the speed and water box control to like off|Low|Mid|High ? just like the right one in the screenshot  (It's a thermostat control screenshot I found on google)

![image](https://user-images.githubusercontent.com/50393226/88966007-357a4680-d2de-11ea-8842-6880b08b0cc2.png)

Is it possible?
Thanks :D
