Glad you like it! Thanks!
I don't currently have any plans to make a variable death rate, as the intent of this mod is to align with the rules of the Decades Challenge, which uses a 50/50 chance. If there is a big call for changing the odds, it's something I could look into for the future.
The rabbit hole was originally supposed to be a full day, but I found during testing that leaving the lot for any reason would interrupt the interaction and the Sim would not get any sort of conclusion, they would simply appear back at home like nothing happened and you'd have to start the process over. It works more similarly to volunteering than it does like working a job, where the Sim stays in the rabbit hole no matter what. For that reason, I chose to make the interaction shorter to avoid this. It is possible to edit this yourself with S4S if you're comfortable editing the code; you would need to change the time_based conditions in the GoToWarInteraction tuning, and set the min and max time to whatever you like. This is something that came up with another user last week, so maybe it's another time I can try to make a customizable addon for.