It just occurred to me thinking about this today while working on the manual: You could avoid this behavior by duplicating all the ticks backwards using Named Ticks. So if your current values are 1, 2, 3, 4, instead use 1, 2, 3, 4, 3, 2... or you could even do 1, 2, 3, 4, 4, 4, 4, 4, 4... This is a vile hack, but might work for the time being. Thanks