You can do whatever you want.
I suggest you use Jason Bottjen’s (@JasonJoel’s) excellent component driver for this device:
It logically splits the device into two devices, a motion sensor and a dimmer. You can treat them as two independent devices if you put the device into manual mode.
Here is the user doc. Look at section 3, info about occupancy, vacancy, manual modes. I’ve got one, works well with @JasonJoel’s component driver.
I assume you know about the 26931 device, which has a switch rather than a dimmer. @JasonJoel has a component driver for that as well. I’ve got several of those, too.
