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Have you even tried tracking more than 3 actors as individual single actor projects, with your current set up? You can record the depth data from more than 3 people in the scene, that's not the issue, but that doesn't mean they will all be able to be tracked optimally, and you will see where the occlusion issues will come in, this has nothing to do with being able to select more actors at once in the tracking process, it has to do with limited space and occlusion.
At the tracking fps you get from trying to track 3 actors at once, it may be faster to just track them as single projects, (3 or more people recorded in 1 scene, but only track them one at a time from a new video each time), since they need to be exported as single files anyway and you may be able to fit one or two more performers in scene (maybe), but you will never be able to increase the maximum capture volume using Kinect sensors, no matter if iPi allowed 10 sensors to be used at once on one recorder, or allowed more actors to be tracked at once.
You can also try recording more people in one recording, then use the 3 actor tracking on just the first 3 in one project, then re-track the video again, selecting the other people in-scene, but you will still not get the results you think you will.
The limitations aren't really caused by the developer, the Kinect sensors have a limited capture volume and FOV, basically a maximum of 15 x 15 ft. of recordable area data, (and that's only when all pointing in a semi-linear direction, basically how you set them up), because you have to be a min of 5 ft. from the sensors to capture full standing data, maybe closer if in a seated position closer to the sensor, but based on the config you have shown, you still can not go further back or to the sides than the FOV will allow, or no data will get acquired (yellow areas) and the performer will disappear into that area also, so no data received by the sensors, means untrackable.
I am sure you could attempt spreading the sensors further apart and see if they still track successfully, and can be walked between, but I don't think you can get 3 or 4 sensors calibrated correctly that way.
iPi, for good reason, has concluded that 3 actor max. (for their selection amount at one time) is a respectable limit to avoid occlusion issues and the limitations of the Kinect sensors.
Since they want their program to run for users with as little error as possible, they are pretty well bound to this actor maximum tracking at one time, but that doesn't mean you can't do a work-around that may work.
If you switch to PS Eyes, you would have more freedom of camera placement, where Kinect v2 are also bound to a level plane set up, PS Eyes are not, but they aren't as easy to use or calibrate when many are used and also track at a much slower fps in studio, even with a very powerful machine.
Only iPiSoft can answer your request to your suggestions, but I think they have already saying, "We do not plan any research in this area for the near time."
Good Luck in your endeavors, hope it all works out well, no matter the final choice of system chosen.
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