creo4 config.pro option documentation for: TOLERANCE_CLASS 
sim_modal_disp_superposition
Category: Creo Simulate
Description: Specify whether modal displacement superposition should be used in dynamic analyses.
Values: yes, no
Default Values: yes
se
, very_coarse
Sets the default tolerance class for ISO-standard models. The system uses the tolerance class in conjunction with the dimension value when retrieving tolerances for general or broken-edge dimensions.