Replacing switches with new ones and wanting to add a zwave dual-relay while I'm at it. It's a 3 gang box and all are on the same circuit. I have an electronics background, but no electrical experience beyond replacing switches and a couple fixtures. I understand the theory but definitely don't know if this is to code. My brief googling is telling me that it should be switched hot for safety reasons.

The house was built in 1922, but it was remodeled in mid-2000 with upgraded wiring. One of the switches controls the living room light and an outlet. However, I discovered the outlet is not grounded when I took it off, so I guess not ALL the wiring were replaced.

Here are pictures of the gang box.
![enter image description here](https://i.stack.imgur.com/BoWZK.jpg)
![enter image description here](https://i.stack.imgur.com/xBYOf.jpg)