Time handling

I recently made a plugin that oscillates over-time. I got 2 main issues with it:

1. The animation doesnt restart when I cut the layer.

2. It gets completely corrupted if I apply it on a layer that starts from like the 3rd second (from what I tested). The idea is that it gets corrupted (acts weird) if I apply it on a layer that doesnt start from frame 0.

Is there any simple fix to this or I must use AEGP suites (LayerSuite9, PF_InterfaceSuite1, etc...).

Am I missing something about how time works?

Also, I have issues with GuidMixInPtr.