none of drama!Lin Jing's inventions are weapons (except for Changcheng's non-lethal zapper), right? I wonder how much that's the ghost vs Dixingren thing, and how much it's a character note for Lin Jing.

Oooh, excellent observation! Yeah, he doesn't even seem to be working on weapons at any point. I figure it's both a character note for Lin Jing, and for (ZYL's version of) the SID in general.