It can be better! Here’s my custom CT-30 interface:
Since there’s no specific device handler for the CT-30, ST is using the generic “Z-Wave Thermostat” device handler for it. If you’d like a different interface with specific capabilities for the CT-30, you’ll need to head into the IDE and change the device type (which device handler it uses) of your CT-30.
Before that, though, you’ll need to add a new device handler to your account. There are a few different ways to do this, and a few different device handlers for the CT-30. It may seem scary, but it can be as easy as copy & paste. Check out this thread for an example DH you could use.
Out of curiosity, what does the WiFi app look like for the CT-30?