Since the update is scheduled to go live on the 18th, I figured I'd insert this as a little additional suggestion.
I don't know if it's just due to my playstyle, but by the time day 5 rolls around, I'm down to the last 10 or so plague hearts and nearing the end of my playthrough on a map. I don't even use mods or legacy characters; heavy weapons are just OP.
How about letting players decide when curveballs start up? Give us the option of what day they begin rather than setting them at day 5 with new communities?