Hi,
Yes, renaming to a more meaningful thing is great.
Also, if only some group can grade entries, then it is wise to have an 'uncategorised' category which appears in a grading list towards, but not at the bottom.
Field experience in these systems tells me that people get annoyed at being auto-classified at the bottom.
I advise putting 'uncategorised' at 5 of 7 or something similar.
e.g Critical, High Import, Import, Medium, Uncategorised, Small, Trivial.
This also helps to raise the visibility of Uncategorised items; i.e Categorise them :)
Regards, Hugo