I haven’t run into a problem like that are you able to repeat that event multiple times? If so you should report it as a bug.
As for the task priority I haven’t had much trouble managing event for example if I’m building something but I need food harvested right away the harvest then loot command will normally handle that issue.
there are a few times it would come in handy like if you had a building started but you needed to move to making a wall right away it would be nice to be able to bump its priority.
I’d also like to see a way to prioritize stock piles for example if i want food at a far location for its source id like to be able to tell them fill this stock pile first before the others so the far reaches of my city or outpost have what they need with out traveling far to get it.
so over all I agree its something i’d like to see in the game one day but that’s more likely a late game feature.