I am not sure if this can be done but I wonder if there is a way to setup the mod (with additional config settings) to make it so the longer the server is alive since wipe (wipe age) the harder the raidable bases are to raid... so for example in the first X days since wipe only easy ones spawn; then as time goes on there are mediums, hard, extreme, etc
I say this because on some servers the populous does not have the stuff to raid an extreme base on the first few days since the wipe.
ALSO can there be a message to people who join after a raid base is spawned to let them know as they join there is a raid base to raid!!!