For selecting start/end trimming points

When selecting the trim range, the first the problem is to scoot around the movie quickly to find the start and end edit points. At present, the only preview speed options are 'frame-step' and 'full steam ahead'. Having double or treble speed would be useful here, even if the right-hand (output view) frame was temporarily disabled. (Also useful would be to have a button handy that would force the preview scene to move to whatever start or end time had been entered. Thus if I set the start time to, say, 00:10:30, I'd like a button that would force the preview to move to that time.)