I forgot to answer this one...
Look for a shadow Tiddler called "P2 - Medium" ... You'll see it's tagged "Cardo" (meaning it's a core Cardo Tiddler, I use that for exports and updates) and also tagged "PriorityLevel" -
Any Tiddlers tagged with "PriorityLevel" become just that.
You can name them whatever you like - that will be the long description, i.e. "P2 - Medium"
Describe them with a short-form, i.e. "P2"
Give them a field called "order" with a number.
This way you can re-name and organize P1 / P2 / P3 into "Do It", "Schedule It", "Delegate It", "Delete It"
HOWEVER ---
In my humble thinking, I already have that with the GTD TaskStatus buttons:
Next = Do It
WaitingFor = Delegate It
Future = Schedule It
Dismissed = Delete It
Seems like a direct mapping to me. You might just want to look for these Tiddlers and rename them!
Cheers,
David.