The 5 FPS is good, but only compresses the time by a factor of 6. At best 2 hours of normal recording would only be 6 x 2 hours = 12 hours covered. Good, but if you don't see a problem right away, it could be erased.
When I listed, "take a frame every 1/4, 1/2, 1, 2, 4, or 8 seconds", that would be a 7.5x, 15x, 30x, 60x, 120x, & 240x time compression. Assume 2 hours normal recording, the time compression would shift that to 15 hours, 30 hours, 60 hours, 120 hours, 240 hours, & 480 hours. The slower frame rates would cover longer periods of time.
In the security camera mode, external power would be required in order to get the long recording times.
The feature is for a home or business that wanted a low cost security camera. ... Just an idea.