While you're at it, disable the airbags in your car, disable ESP and remove the brakes ... Seriously, there's no need to disable UAC to run an application like DCS.
DCS:BS1 required privilege elevation (in Vista and newer) because it required write access to files in the Program Files directory (not a best practice). This was addressed with DCS-A10C (and hence with DCS:BS2) where these files are stored in the user's profile and are thus writable without privilege elevation.