Hi there,
Thanks so much for your lovely review and feedback!
In our latest release on Patreon, we added a change to the janitor that has their speeds match the cleaning upgrade, so they are hopefully now less frustrating!
We also added the secondary icon for the rooms next to the main icon so that it is easier to see.
We'll definitely keep in mind the extra customization options, but as this would be a significant addition to the game, I can't really say if we'd be able to do so.
Thanks again!