I've had an interest in modding these events, too. Have you sorted this out, or is it still an issue for you? From what I can gather here, it seems like a simple misplaced (-) throwing things off. Do you know how to force your event, or are you just playing along and hoping your modded event pops up? That sounds like no kind of fun.
As a related question, is there any way to have a choice affect two or more abilities? I wanted to include the idea of some kind of sacrifice for good choices, but from a glance it seems we can affect one ability and impose a monetary gain/loss.
I've been fixing races and UP issues, but this is next on my list. I'll let you know what I find.
ETA - First, I was wrong. It's one ability and population gain/loss.
Second, you're right. It seems that no matter what you do with the (-), Good gets a penalty and evil gets a bonus. Only the neutral value can actually be either a bonus or penalty.
Boo.