How to change the default scope of a model to be " TASK_SCOPE " ?

Hi .. An adaptive RFC module is imported in my webdynpro program . At runtime , i found the Default ModelObject Scope is "APPLICATION_SCOPE" . Because we set the maximum pool size = 3 of the JCO Connection in SLD , that means , only three application instances will work and the others will fail when try to call the RFC module . Sorry for my poor English and i hope someone can understand my problem and give me some help .. Thanks a lot !!