Option to clear opposite side's keyframes with Flip Animation

[Cubouse]

Detailed description of your suggestion

It would be useful to have an option called

"Clear channels of the opposite sides in selected range before flipping",

or something along those lines, next to "Offset by half the animation length" and "Show modified bones in timeline".

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When selecting keyframes on only one side of the model (say, "leftLeg0", "leftLeg1" etc), it would delete the "old" keyframes on the sides that are about to be generated (so "rightLeg0, "rightLeg1", etc).

It would only delete the keyframes when keyrfames on the other side were selected, and in the range of the first to last selected keyframe on the timeline.

It would particularly save time when adjusting the timing of keyframes repeatedly.