You can purchase tickets direct from Disney without making it a package. In this scenario you would need to pay in full at the time tickets are purchased. New date-based tickets are valid for length associated with number of days booked, regardless of your room reservation. The Room Only resort reservation remains as-is (due at check-in). You will “own” the tickets even if you cancel the room; value can be applied towards future tickets if necessary.
Or, you can add tickets to the room reservation, creating a package with $200 deposit and full amount due 30 days prior to arrival. Tickets can be adjusted within the package (adding days, hopper, etc.). The new date-based tickets will be good for length-of-stay. If you need to cancel prior to 30 days, both room and tickets are canceled. However one key aspect is the Room-Only is essentially cancelled and you’ll be rebooked as a package, the funds may not transfer (requiring a refund of original room deposit) and you might lose any discount rate; but you may be eligible for a package discount or offer.
Enjoy your vacation!