Hi,
The "Vertex Normal support" it's still pending and unfortunately it doesn't look like something that can be done easily in a short time period. To be honest, as the overall 3ds max's support of this feature has several limitations and in many cases these will be reset (like in some cases when attaching / detaching Editable Mesh objects, applying some modifiers (like the Slice one), non-compatibility with the Editable Patch objects etc.), we're not even sure, if there'll be a suitable solution for our plug-in integration maintaining the compatibility with all actual (and new / under development) features. Thanks for your comprehension.
Best regards,