Ability to add custom "rooms" for janitors

I have a big hospital and require a lot of janitors, The janitors usually clean the floor's that have "rooms" selected, eg. Trauma Center, Observation Room, and other rooms. There are also huge dirty spots in the hospital because I can't place a room on those dirty spots. I can't place a random room and get the janitors to clean it. The latest DLC with assigning janitors to rooms helps but it doesn't fix the problem that you cant place a janitor to clean floors that don't have a room placed.

This picture shows the area where it's dirty.
https://steamuserimages-a.akamaihd.net/ugc/1468688596968459974/454F3797FBCCB6967B3CC0E5F4A8648F964DCAA1/

This picture shows the layout of the rooms
https://steamuserimages-a.akamaihd.net/ugc/1468688596968459620/237A95BC02F9D65F5958B96075CE1C76C6325BAB/

As you can see, the floor is insanely dirty because I don't have a room assigned to that area to get it clean.
I tried assigning a random room to get it cleaned and it worked but It messed everything else up.

My suggestion is to add custom "rooms" for janitors to clean instead of it being default rooms.

Thanks.

Hi, thanks for the message - basically this is what the "corridor" room type is for. Have you tried marking the area as one or more corridor sections, or was that what caused the other issues you mentioned?

Thanks for the response. The issue is fixed with the dirty floors. I never even considered using the corridor and adding the corridor that fixed that, but I now realized another issue with the floors, If you look at my 2nd and 3rd floor, you select the very edge of the floor. If you try to create a room and drag the room, it won't go past the 2nd to last set of tiles.
https://www.youtube.com/watch?v=OV4MTV1SmrM