Maybe this isn't strictly UI/UX, but when you create a maneuver node and you get the burn time window that pops up, the information in the window does not update if you change the engine's thrust limiter. The only way I was able to make the info display update was to go back into map mode, open up the maneuver node's controls and click on one of the controls. This doesn't alter the maneuver but it's necessary to make the calculations update. In KSP1, the times would update to match the current engine thrust limit immediately.