Over time it has become possible to alter what koha-create does in several ways: the default config file, custom config files pointed to by the --configfile option, as well as specific command line options for --defaultsql, --marcflavor and --zebralang. 

It might be a good idea to have koha-create outoput a summary of what parameters were actually used, to avoid surprises. My preference is to do this as the default, but it could also be hidden behind a --verbose flag.