Another suggestion, instead of making classifications for major, minor, trivial, how about an impact statement?
Game breaking
regression
no workaround, game breaking
no workaround, inconvenience
workaround
inconvenience
Also, regression scenarios are generally higher priority than new bugs, which could become "features" instead. Right now, I have everything triaged as "other" under bug, and minor, instead of something more specific that might help you prioritize.