The fisheye effect is awesome and I see so much potential for crazy transitions but sadly there are no keyframes for the effect :(. If this were to be added it’d be soo awesome. Might even look into it myself if I find the time at some point.
@shotcut OP is speaking about the fisheye filter, there is no setting which can be keyframed in this filter 
Shotcut was indicating that the lens correction filter does the same thing and supports keyframes
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Oh… ok, thanks, I did not get it 
I guess it is a good workaround sure but I feel that the fisheye filter is a bit more intuitive and easier to use. But I will use that then instead for now thanks for this approach!