Currently, Merge Actors generate collision primitives for each static mesh if ‘Merge Physics Data’ is checked. However, it does this for all selected static meshes. If static mesh had collision preset set to ‘No Collision’, it is supposed to have no collision. It would be nice if Merge Actors tool would not generate collision primitives from meshes with ‘No Collision’ preset.
It is not difficult to remove unnecessary collisions manually in Static Mesh editor, but such addition to the tool would be welcome.