I have the same problem here, when the animation ends it jumps back in the first frame and it doesnt really look that good :/
I kind of fixed it by first rendering the normal animation, exporting it, then rendering the reversed animation and exported that too. Then I loaded both animations in my engine and made it look good by deleting some frames myself.
It would be great though if CodeManu would implement this feature in the program, and I find it kind of sad that he doesn't reply when I ask him a question.