You don't need to keep it all straight, you can yaw the spark but take it really really easy on the sticks. Also, you can keep shooting. After you trim any jerky movement using any editing software/app.
Take it really easy on the sticks. Turn off the sport mode. Turn on the tripod mode. I usually use the sport mode to get to the subject then turn it off so I have much more control over the shooting.
I could be wrong but as far as I know there is no way to turn off the bottom sensors. Unless DJI provides us with an update that allows turning it off.
In order to download the map you have to turn on the cellular data. Otherwise you gotta previously download it. If there is no map spark cant locate herself, thats why you cant set the home point.
Actually most Android users are having issues to use the OTG cable. I'm not sure if the last update has covered this issue. You are gonna have to study better about this subject.
Below you find the list of supported/recommended devices.
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