I found this in AMXX Documentation, regarding that function: "Do not use this to set models, use entity_set_model." Should I use that function with the same entity?
EDIT: Apparently, using those entities with entity_set_model returns compiling errors.
EDIT2: I've done some searching in the includes, the "entity_set_model" function has been replaced with "fm_entity_set_model". Now... the plugin compiles clean. I'm gonna test it to see how it works (if it does) and I will be back with another edit, the third, hopefully the last.