The options are listed as part of daml sandbox --help
but fully agree that some more documentation around the defaults and those options would be very helpful.
moritz@adjunction ~> daml sandbox --help
Usage: daml sandbox [--port ARG] [--admin-api-port ARG]
[--domain-public-port ARG] [--domain-admin-port ARG]
[--canton-port-file PATH]
[--static-time | --wall-clock-time] [--canton-help]
[-c|--config FILE] [--port-file PATH] [--dar PATH] [ARG]