I've decided to archive all old suggestions and start clean, with a few changes. Normal users will not be able to post feedback or reply to an existing suggestion. After a suggestion is posted, it will be reviewed by a member of staff, if it's what we're looking for, it will be accepted, otherwise declined. The suggestion poster may also discuss it further with staff.
That's what General and possibly Help is for. Originally, Element suggestions was a vent for Feedback getting crammed full of suggestions for new elements.