My shadow engine based on the workflow of my previous article.
It will work as is only for 2.5++ version.
Just copy paste 2 actives, make sure Layer 1 exists and has RGB coef. black and some transparency. Place and set few specific Alterable Values and everything else is automatic.
Automatic animated shadow.
Check my article here for more info on this approach.
Download the MFA here for free.
You really don't need to add any events. Only disadvantage is it uses the 2 first alterable values of your objects.