Slitherine

I want more specific control over which notifications I see than I get from the notifications settings in the menu, so I've taken to changing Messages.csv. But there's some I'm not sure how to change. I want to change priority for the messages you get from Black Market events (exotic slaves, new armour) and the message that tells you you've lost a regional decision because you have too many, but I don't know which those are.

Is it safe to alter Messages.csv directly in the game folder? Is that likely to have any adverse consequences?

You can alter the file as you wish, it will only impact messages

Black market messages uses a semi generic message generating text, you can't alter it specifically, unless you work with the code around like 4611 of events.bsf

The same is true for regional decisions, that's not a message category specific to them.