The computer limitation that drives me insane is being unable to move XX days in the middle of a group when it doesn't break any days-off rules. Say I have 5 XX days and want to move the middle 3 into another legal block. Can't do it in just 1 PCS run because you get a false illegal days message. You can only move groups of days touching the ends of your XX days, once that exposes the original middle days you can move those originally intended middle days, then you can reset the original days on the end caps. What should take 1 PCS run takes 3, and there's the chance that those blue days will turn black while you're farting around getting around the technology. This flaw bit me hard in December when my blue days turned to black in the midst of this IT buffoonery.