There seem to be some hits on google regarding this. And in official AD doc:
https://knowledge.autodesk.com/support/3ds-max/learn-explore/caas/CloudHelp/cloudhelp/2016/ENU/3DSMax/files/GUID-B2DFC985-CD43-45DC-9CAC-F3052497B452-htm.html
There's a "Multi-Shape Random Order" option. I never tried it myself but it sounds to be possible.
Marsel Khadiyev (Software Developer, EPHERE Inc.)