First, modding in characters is not yet available in any version. It is planned to potentially happen, but there is zero ETA when that will happen, or if it ever will. It really depends on how things are going on now. If you are looking for certain characters and what events you can do with them, I'll be happy to help you out.
Second, the lock pick is not yet available in the game.
Third, the gallery is not currently being used, but is likely will be used in a future update eventually. I do not know what exactly it will be used for, but my personal guess is to let the player experience events over again.