Yes!
As of recently (App Version 3.5.0), you can turn OFF the brake light feature inside the UNIT 1 App.
How?
Go inside your UNIT 1 App
Tap the button ‘Turn Signals & Brake Lights’
Effects: Solid, Strobe, or Off
Off: Turn Off Brake Lights. They will not show any light.
Tap ‘Save’ to save your settings
All set!