I support this, but we should be careful about the wording. The problem with lowest is that is has negative connotations that I would like to avoid- that is why I proposed to name the above levels:

* unbreak now

* very high ("urgent" works too)

* high (equivalent to work on next)

(* normal) this would be optional, but in case we want to keep 5 categories

* low (no intention to fix, old lowest)

While this seems to be an inflation of the name usage, the original issue, and the one I still have sometimes, is to say something is "very low", which in my experience doesn't sit well for the casual reader, even if it has a relatively well established meaning, and leads to people complaining and getting an explanation, etc.