In this paper, we study how to extend the control over the behavioral space of logically specified agents so as they can take into account parameters issuing from constraints and/or preferences that are external to their core reasoning process. Our approach is supported by the proposition of a set of generic transformations to apply to the original agent program that is expressed in IndiGolog, a variant of the Golog language. Several of these transformations exploit the non-determinism present in IndiGolog programs. We also propose an automatic process to apply all those transformations on the basis of a set of parameters. Three case-studies show the significance of the approach in situations where agents are in interaction with human users.