As Valdis said every knigdom has had this problem and done something to deal with it. Myn I wish you would get it on the next agenda.
There is one thing I think could lead to abuse and that is point 1.v.
"v. An Errant Combatant does not count toward a Knightly List, but may still win a Knightly List."
imho if a knight combatant feels that they don't wish, for whatever reason, to count towards a knightly list then they should also not be able to earn them. I think this should extend to judging of MP/MW and gaining new ones as well for the knights of the other two tiers.
Another question would be how does the errantcy affect the estates voting rights of 2nd and 3rd level knights?
Duke Sir Lassidor Vandolini, KC, BOD treasurer, Imperial Exchequer, Defiance member, BoC of the Kingdom of Vega