Great write up Ri22o!!
I would also like to mention that when a spotter cam trigger the ptz and when the ptz move to the desire preset, user needs to be aware of few seconds of delay (reaction time) as well as the distance between 1 preset to another preset.
If the distance between presets are too close, user will risk missing the subject and the subject walking out of the field of view before ptz could "settle" and starts tracking.