The thing I would find most valuable is for CREO Parametric to automatically calculate a part/assemblies outer dimensions (think a bounding box) during regeneration. Even having this as part of the analysis tab and saved as a feature of the model tree would be better than what we currently have.
This data could be used in parameters and relations as needed.
When making a BOM of materials needed being able to pull this information from the models and populate the BOM would be a massive time saver.
This function exists in most other CAD software and others inside my organization cannot believe CREO will not calculate this efficiently.