Is there any way to change the playback speed to 1.3x instead of 1x?


I have only five choices of playback speed 1/4x, 1/2x, 1x, 2x and 4x.
but I need to play my animations at 1.3x or 1.4x speed or someting else
Is there any way just to change or adjust the playback speed without affecting keyframes?