*Not sphere, roundedish squashed sphere like planar type shape
The sphere which a lens renders in focus is not in any way, shape or form influenced by the size of the sensor that it is projecting onto. A lens displays the exact same precise DOF no matter which camera you mount it too.
Test this for yourself, grab a lens and a piece of paper. Go into a dark room, point the lens at a string of lights until you are projecting an image of the lights onto the paper. Now swap the paper for a different sized piece of paper, notice how the image being projected is still the same.
Know where your nearest hardware store is and have some money for those little things you may want or need.
If you are alone or there are only a few of you and you are somewhere that is difficult to control the public, get some various colours of electrical tape, the kind that looks really scruffy and peels off all by itself - if it's been kicking around in a tool box for a couple of years, even better. Tape up a few key pieces of kit to make it look like the electrical tape is holding it together. I've found that nothing deters a casual thief more than making your gear look worthless.
Also, just to reiterate one of Alex Richardson's points - Flasks of hot drinks, be it tea, coffee, hot choc or all of the above. Nothing makes the day go better than hot beverages on demand!
"It's really easy to add great motion blur in After Effects"
"most general consumers don't ... fully understand how to apply motion blur in post."
Try not being such an unethical wideboy and being honest and upfront about your product. For a product that stitches photos together into a video, it's neat. As a competitor to a 4k camera, it's a toy. This line about being able to apply motion blur in post is just the worst kind of nonsense - Until I read this, Ubisoft with their "video games look better at 30fps than 60 because it's more cinematic" won my award for most exploititive lie of the week. Now it's all yours. Because like Ubisoft, stitching together 24 or 30 crisp frames together makes for a headache to watch. That motion blur that is so easy to apply in post that most people don't know how to is not at all easy to recreate in the same way that a camera does. When a camera produced motion blur, what you are seeing is the effect of the genuine movement of the thing being filmed, and because our brain is so amazing it can very easily tell the difference between the genuine motion blur and an effect applied in post. The reason you haven't produced a video with motion blur applied is simply because you tried and it looked like blurry bunk. Prove me wrong, if you can, reply to this with a link to one of the videos above taken with your app, apply this easy after effects blur and show us how it looks.
If you can't get these straight away, I am very jealous of you because you have some amazing movies to see and you get to see them completely fresh for the first time!