They are not meeting the goals of the IEP. i am a special education teacher for the other end and if I tried to play that game I would be nailed hard. You can incorporate many things but that is pushing too far. A differentiated spelling list should be offered in any regular class as part of differentiated learning to meet the needs of all the students. If they are using one list for all they are not meeting needs of all. Be sure to throw out the term differentiated instruction b/c they are not doing it. it is a basic philosphy currently used in all types of ed. If you were ready to go to the board push and you will see results b/c they are not doing what can be done.