Yes, they sure can! You just need to let them know your using credits for the meal and tipping with the gift card. We usually either tip with the gift card or send it back to the room.
You could also have the tip applied to the room and then once a night/every couple of nights go to the front desk and use the gift card to pay down the room total that way.
We have a sticky thread on the main board for tipping Mechanics. Closing this one and if you have any questions, take a look at that thread. Very helpful (and explains why we do not allow per tipping habits discussion
Dreams Unlimited Travel is committed to providing you with the very best vacation planning experience possible. Our Vacation Planners are experts and will share their honest advice to help you have a magical vacation.