Hi Walt,
1) I'm afraid not, there is no commit/rollback as in Juniper for example. You can play with different configuration files, but this requires a reboot.
2) Correct, at least if you're not using
auto-save. If you don't have physical access to the box, you can schedule a reboot in the near future to go back to the previous config:
reboot time <month> <day> <year> <hour> <minute> <sec>
Don't forget to cancel the reboot if changes were succesful
🙂reboot cancel