In my understanding it should work with ENABLE_RENDER. But I just had a look in the manual about that and it says this:
 Quote:

Die event-Funktion des Materials wird für sämtliche sichtbaren Entities kurz vor dem Rendern des Material-Effekts ausgeführt.

This could mean that the event function is only called once for all entities just before rendering. But I am not sure. Especially because the way it was used to be was quite usefull.

What you could do would be to create a copy of the material for each entity or using entSkill41-44.