Is it only meant to work with self casted spells? The way its worded makes it seem like it should effect RF.
Those passives, both the AoE for spell skills, and the AoE conditional on killing things recently, do apply to Righteous Fire. It's hard to notice, espesciually if you have other area modifiers which they'll stack additively with, but they do make it larger - just not by a huge amount.