This question has been arround for years, and as far as I know not been answered satisfactorily. For me it shows a requirement in PLM for more task oriented interfaces, I know of a few custo mobile apps that have workflow interfaces that might be the way to go. Does the PTC mobile app have this too? I got the impression it was more 3D oriented and less business focused, but stand to be corrected.
For me in your specific case the executives need a simple smart phone app, with an offline mode that syncs up when back in the office.
Simon