Allow numeric settings for Effect Speed & Smoothness/Length

[LDaniele]

When trying to recreate an animation from a new Start and End image, it is often difficult to reposition the "Effect Speed" and "Effect Smoothness/Length" sliders to exactly the settings used before since there is no numeric indication of the slider value. It would be helpful if the slider at least displayed some value related to the setting. Better still would be an edit box or spin control letting you set the value to some known setting. If there is some simple way to do this now, please let me know. (Currently, I take a screen capture of the sliders and then try to reposition them per the screen capture.)