GTVFX-MSH_proOptimizeSelection
For each object in your selection a proOptimzer modifier will be applied and calculated to the percentage you specify.
Once applied and you can update the spinner in the UI and see your objects update in real-time.
To install just drag the download .MZP file into the 3dsmax interface. You should get an Install dialog.
This tool will install a macroscript that can be accessed from the Customize User Interface dialog within 3dsmax.