Can you adjust a slide duration without dragging the end point?

I too would like to know if there is a way to adjust the length of the slide without dragging the arrow.  I was looking for a feature like in Captivate where you can manually type in the length of the slide.  It would make it so much easier if you have a slide that is say 900 sec long and you want to shorten it without having to drag over that super long period.  If it is not available, definitely needs to go into the new release.