No there isn't and it would be nigh on impossible to implement if it was tried! Med board sits & decides Med Discharge is what's required, fills in paperwork & sends off to Unit Med Centre & APC. APC then plough through it (along with all the other Med Discharges they're dealing with) and finished paperwork goes to SPVA Norcross who decide what level of disability you are awarded. Whole process takes anything from 3-6 months as APC on go-slow.
Look at it this way, the longer it takes the more your wages go in the bank!