EF_BONEMERGE is defined as 0x001, or 1.
This effect merges this entity's bones of names shared with its parent to the position and direction of its parents.
To use this effect, turn off SmartEdit mode and add the following keyvalue pair to the entity:
Remember that you can set the effects value during runtime using an entity's
AddOutput input with the input value
effects x (x being any summation of effects flags to enable).
Warning: Using the AddOutput functionality for this, the new value may interfere with an entity's simulation functionality.