Schools of Fish looping

[Syu_z]

Tylooper works in my initial testing. My question is, am I able to control the animation curve of the start and end of the loop so instead of linear, it's bezier curve with a slow in/slow out? It works almost perfectly. If I am able to control the curves of the loop, that would be great.

I understand that it might be difficult to implement though (if it hasn't exist yet) because as far as I understand, it's blending between two different animation state and averaging out the position.