There’s already a tool to make new levels in, L4Vo5’s Lockpick Editor, which includes all of the non-Salvage mechanics from the original (and I believe Salvages are planned for an update). L4Vo5 doesn’t seem to intend on adding fanmade mechanics, but he’s also made the project open-source, so I imagine that someday someone (perhaps myself; I do intend to try my hand at this at some point) will make a version of it with additional mechanics added in.