Dear XXX,
Thank you for your email. As you mentioned, NSW does not offer letters of release. It is ok for you to leave NSW to pursue your PhD in South Australia/Western Australia however the expectation is that you fulfil your 2 year committment to NSW after you have completed your PhD.
Regards,
Johanna
所以,对于 letters of release,没有迫不得已的时候,没必要申请。当然,当你去别州读书,各州貌似还是比较开明的。