[chiefweasel]

It all depends on how much of a change you need to make. If its just a campaign setting then you might be able to use the Editor to create what you need. If its a huge system change it might require a huge effort and then could require the Authoring Kit.

The big difference between the two products is that the Authoring Kit is used to create brand new systems and the Editor is to make changes to existing systems.

For instance I used the Editor for my Dragonstar system, but there are a few features that I have had to fudge to get to work. I could have used the Authoring kit but then I would have had to code the entire system from the group up.