Nice.
Really if you wanted you could test it yourself easily.
This is where the feature exists in older Dahua firmware, just under the PTZ controls in the web interface:
I think they renamed the option in the dropdown list in more recent firmwares.
Anyway a problem I was having with older SD6982A-HN and SD6582A-HN models is that about 5 to 10% of the time when I used this feature to change the zoom level of the camera, it would fail to set the zoom level and cause zoom to go unresponsive for 30 seconds or so, an error message would appear in the video, and the video would go green. Then everything would go back to normal.
This bug basically meant my custom PTZ interface could not use zoom because it would consistently break itself within the first minute of using it.
So to test this reliability, you would just change the zoom level
a couple dozen times using this control and see if it works reliably.
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Also I have one other question; does the weather sealing on this camera rely on the camera being mounted with the dome facing down? What if I was to mount it facing up for a moon-tracking project I've been thinking of doing?