[Saulot]

That seems rather cumbersome. One would have to play through each battle at normal speed in order for fraps to record it. Then one would have to either switch out or exit dominions and then reload the video file in some external program and then replay it to get the forward/backward ability. This would also be unsuitable in some situations since you lose the ability to examine units, which is useful to see how certain mages use gems, if an enemy sc acquires an affliction, etc.
AFAIK fraps also saves everything as uncompressed video which would then need to be compressed if one wanted to share it with anyone else (which can be rather time-consuming, particularly for the very many battles that can occur in one turn during the late game).