We collect Jira feedback from various sources, and we evaluate what we've collected when planning our product roadmap. To understand how this piece of feedback will be reviewed, see our
Implementation of New Features Policy.
We've made the project key a configurable option (by admins) in the next major release - JIRA 6.0. We were unable to put this into a minor release or point release because it included changes to our stable API. Our rule is that breakages to APIs can only be done in major releases.