A: It mainly affecs the pin's position on your lockscreen. Normal displays the pin like a normal notification, private hides the content-text and secret hides the whole pin.
A: Maybe because you are using a Android version below 5.0, where the visibility-feature doesn't work since it has been introduced with Lollipop.
A: I don't want to add more permissions such as network or internet-access. If I find a way to sync it for example with Google Keep, I'll add this as feature.
A: Mainly the position in your notification-center. High places your pin above every other notification, low below every other notification and min below a small divider, completely at the bottom of your notification-center.
A: If you got for example a lot other high-priority notifications and you add a pin with priority high, Android will choose its position.
A: You can find the whole code there: https://github.com/dotWee/MicroPinner
A: Ideas and feature-requests go the Issue-section of the git-repository.
A: Crashes are reported automatically using Google Plays Crash Detection and get automatically reported. If I didn't fix it in less than one day, open a issue on github.
A: Creating a new Issue or message me per mail at coding@dotwee.de.