Update notes:

New config option:

Code (YAML):

# This determines if a player in LC can damage entities or not
player-damage-entities : false

+ Added the ability to enable killing while in LC, this is off by default.
- Fixed an incident where if you used another non-lc command (/gms, /gamemode survival, /gamemode adventure), you would lose your items.
- Fixed a bug where you could not give other players LC through console, it now sends a message when it has been done or if that player does not exist.

Potential Future Updates:
I'm looking into the ability to block the creation of certain mobs via multiblock structures (i.e. wither, iron golem). Until then, I recommend blocking key blocks (wither skeleton skull) from being placed.