Implementation of TSG

My husband and I attended the Parenting Mastery Training this fall and we're working on implementing TSG in our home. I see how it is helping our family and have some questions about implementation:
1) How would you deal with a situation where a child has earned a consequence that is time-sensitive and they are not accepting the consequence? For example, yesterday my 5-year-old-daughter earned an extra chose and I asked her to change the towels from the washer to the dryer. She did not do it right away and later that night she got in the bath tub with her bath towel still in the washing machine. My husband then put the towels in the dryer so she would have a dry towel. Since her chore was done by someone else, how should we handle situations like this? We've also had this happen with dishes that were not getting done.
2) Another challenge we have had is our children taking off their seat belts while driving (especially our 7-year old and 3-year-old). What advice do you have on how to handle situations like this?
3) When I give our 3 1/2-year-old an instruction or tell her she has earned an extra chore, sometimes she tells me "I choose to play instead" like London LaRae does in your children's book and doesn't do the task immediately. (By the way my kids love those books on the 4 basic skills.) How should I handle this?