i like the today jira process, if you want a higher priority, do some job solving the problem, after that we could have NEW FEATURE in JIRA, like:
send the patch and marke the issue to "PLEASE REVIEW I HAVE SENT A SOLUTION!" (i don't remember but when this occur i set the issue to major (sorry i will not change it))
the automatic won't fix, and the two releases i think it's not nice, i sent some ideas that in my option will take many time to start a development, and maybe with this 2 releases idea it will never be done
i think mariadb use jira with the sprint idea, group some issues and work on it, that's why i think changing issue isn't a good idea, the main idea is how to put the issue in the sprint