Actually, there is a way to do it, I believe.
If you have unused tickets from prior years that don't expire, you could use 1 day from ticket 1 and use 1 day from ticket 2... obviously, with the MYW pass you need to buy the 'never expire' option if you plan on using them in the future, but that is a way to do it I believe.
Experts, am I interpreting it correctly ?