As I've previously told you, single mesh seems to work only with level blocks and never meant to work with entities.
WED Block Properties

As for the rest, I'm pretty sure that WED (Acknex in general) isn't capable of handling modern standards of graphics (not even modern but like 2010-15 standards).
I would suggest switching to other game engines, I'm personally trying out Godot engine, which amazes me with how simple things are in modern gamedev.