Sample Start and End Points
IMHO, the Sample parameters should be changed to Start and Length. Currently, if you want to 'scan' through a sample you have to move both the Start and End points. If the End point was Length instead, you could scan through a sample with just the Start point as the Length stays fixed.
This change shouldn't affect existing samples as by default the Start and End is set to the length of the sample anyway.
This would also pave the way for proper modulation of these parameters via LFOs etc.