I think if it is cool enough for you to drive the car then the charging is OK, you will never be charging while parked in the sun. For long life, 45 degrees is the recommended limit, but 65 is not a safety issue, the battery pack will puff up if you try charging near 80C, safety should only be compromised below freezing.
For parking mode, audio can be very useful, especially with a single channel dashcam - audio will record the rear hit. Timelapse has no audio. Battery life is not much different between them, although a very low frame rate timelapse will have the lowest power use.
For the shockproofing, make sure the air can still get to it, they do generate a bit of heat at high charge rates. Durability seems to depend on how they connect their cells, used to be common to use silicone covered cables which were fine, these days many cheaper ones use welded metal strips that can fracture with continuous vibration, not much you can do about it, although if they fail it is worth attempting a fix with some nice flexible wire.