I have a few things that might be beneficial to rust.
1.) mode of transportation; bikes, longboards, skateboards, wagons?
2.) Gardens. To be able to grow your own fruits vegetables and herbs could help a lot when resources are low. plus, herbs can be used for poison and remedies. (maybe even some psychedelics) =O
3.) I know this last one is being developed but, traps. pit fall, swinging logs, and maybe even some tar and feathers xD
thanks for reading! and hope some of these could work =)