2. Mine is the Professional2. No .. stills or video but not both
If you have the Pro model you can extract reasonable stills from video
3. A small amount of drifting is normal .. +/- 1 foot or so if you have good satellite coverage.
Close to your house and under tree cover, sat coverage may be sub-optimal.
Check your settings to make sure that the gimbal is set to Follow rather than FPV for smooth video.