Forgive me if I have the wrong Idea but...
I don't know if you have that feature in Rm2k. The basics would mean that a switch
will be flipped when the spell is used,and a variable will track the turns between the
Using and the effect taking place. However,Rm2k3 offer this feature and more. But If you prefer simpler,more easier controls of 2k stick with it. Someone else might know how but I would transfer the project to Rm2k3.