Agree with Karmakeld, you are so great with game's content!
Regarding luck and morale above 10 or below -10. Does it really make sense? Let's take morale. 10 morale means guaranteed morale next turn. It means you can not be any happier. You are absolutely happy.
Now you cast sorrow on the happy stack. Does it make any sense that the stack remains totally 100% happy in spite of sorrow?
I kinda feel it's not really that unequivocal.
It has been fixed too.dalai, btw there's a similar bug with another decrease/ script. if you try to decrease dwelling population, this will also go beskerk after loading. Instead of decreasing, it will generate 65.489 monsters pr. turn.
If you continue this bug-guessing game, you may easily run out of pleasant surprises