Okay, this one will be fixed in version 0.9998. It's pretty rare for quests to force a time skip mid-quest, and off the top of my head, I can't remember if there are any other in Tarkas (which is the only place where the schedule should trigger). I think you should be fine using the schedule, but I can understand if you don't want to risk it (the schedule has been a very late addition, and so it hasn't been tested with a full playthrough).