Please contact support@shortcutlabs.com for support issues. In this case, does the Flic light up with red light when you press it or insert the battery?

For each Task you can press the settings icon in the top bar and disable "Use notification shortcut".

Hi. This has been resolved in the latest app update.

Hi. If that app supports HID we could add support for it (kind of making Flic act as a keyboard). So for example we can simulate the key left/right etc.
If it does not support HID you could try to contact the authors of the Audible app and request them to add such a feature.