Yes, Pack Author group can edit their posts.
@Kesta, can you edit your posts?
@Paul, just be sure you are previewing your posts before posting. Re-reading posts is something that the staff does and is just a good habit that catches 90% of all mistakes. Members are elevated upon request when there is a real need for it. Fixing spelling is not considered an honest need for the feature.
We might have a better middle-ground solution for the editing feature. Just waiting for S4N. More to come...
I don't miss the edit feature, like you said just read it through before you post, I am able to correct my mistakes well-enough by slowing down that way. Changing the up/down vote system to just up is a good idea, for various reasons. Maybe add an explanation in the STEP citizenship document that it can/should be used for marking relevant or helpful advice, the "reputation" system would then be a rough estimate of how often someone posts something of that nature.