Folks - there is a difference between "pre-paying" and "auto-tipping."
When you pre-pay your tips, they are added on to your cruise cost that you pay BEFORE your cruise. Pre-paid tips cannot, if I understand correctly, be removed from your account because you have already PAID them before you ever set foot on the vessel.
Auto tipping happens on the first day of your cruise. $10 per person per day is "automatically" added to your account. Your account is not settled until the night before the last day of your cruise. If you to remove the auto tips you can do so at anytime. So you could remove the auto tips on your last night and hand out envelopes for the amount you deem appropriate. Once you remove the tips, they should NOT show up on your final bill.
Carnival Elation March 11
Carnival Imagination Sept 07
Carniival Sensation Dec 06
RCI Sovereign of the Seas Sept 06
Carnival Miracle Sept 05
Carnival Glory Sept 04
Carnival Fantasy Jan 04