I'm not sure how many builders out there use CEP's Sparky Spawner encounter system (included with version 2.3+), but I'm posting for those that do or might want to.
I know the system can be a bit confusing to get started with, and it can take some time to get used to. I've been using a large part of it for quite a while now, and another builder asked me about my methods. I've started a thread on the CEP's forum to share some of what I've learned, along some script work to speed up the addition of encounters to areas.
Link:
Sparky Spawner: Tips, Tricks, & Troubles