A pro forma MRT application lodged with the stated purpose of triggering ministerial intervention would probably be dealt with fairly quickly. For self preservation, a RMA/lawyer would have to advise the client and the MRT that such an application application was pro forma.
It is interesting to note that:
1. in the face of an onshore visa refusal (other than partner) that a valid partner visa can be applied for onshore
2. the minister has recently intervened without the trigger
3. when they (DIAC) know they are stuffed they sometimes adopt a strategy of simply not processing an application
4. a representative can often have matters deferred more or less endlessly - I have come to the matter somewhat late - I am dealing with another matter on that date, my client is not well enough to give instructions, my client is not well enough give evidence, you failed to exercise jurisdiction and we will be seeking leave to appeal...
I have just had a sponsor die during the final stages of processing a carer visa application. I adopt the same moral/ethical stance as ministers for immigration - if it is legal and it suites me, I will do it.
If it is not legal I will tell clients/prospective clients why, and what they then do is up to them.