I just finished Steelheart today. I've read through many of the forum posts and I didn't see one that was discussing Gifters in general.
I think there is something special about Gifters. Gifters are supposed to be pretty rare, which makes them special for that reason, but I can't help but think there's something else about them. Something that let's them become Gifters to begin with.
Out of the three gifters we know of (unless I'm missing others that were mentioned), Prof, Conflux, and Digzone, two (and depending on Digzone's identity, all) of them are....not benevolent exactly. Maybe lacking in evil. I would say they maybe even have the capacity for Good.
Obviously Prof has the capacity to be influenced by the powers, we see that pretty clearly. We don't really see anything of Edmund being influenced by his powers. The one time we see him using them, or are told about it, he was only trying to power a microwave.
I'm wondering if this has something to do with why they're Gifters? Is it their lack of desire for power in the first place that allows them to give their power to others? Maybe the Gifters will end up being the "Heroes" the Faithful are waiting for?