1. A method for execution by a dispersed storage and task (DST) processing unit that includes a processor, the method comprises: receiving, at a processing system, a data object for storage in a dispersed storage and task network (DSTN); determining, by the processing system, a retrieval reliability level associated with the data object; determining, by the processing system, baseline dispersal parameters for storage of the data object utilizing a dispersed storage error coding function; determining, by the processing system, a write threshold value for storage of the data object utilizing the dispersed storage error coding function based on the retrieval reliability level; encoding, by the processing system, the data object utilizing the dispersed storage error coding function in accordance with the baseline dispersal parameters to produce a plurality of sets of encoded data slices; for each set of encoded data slices of the plurality of sets of encoded data slices, generating, by the processing system, a set of write slice requests that includes the set of encoded data slices; outputting, by the processing system, at least a write threshold number of write slice requests to a set of DST execution units of the DSTN; receiving, by the processing system, write slice responses from the set of DST execution units; when the write threshold number of favorable write slice responses is received: generating, by the processing system, a corresponding number of commit requests; and outputting, by the processing system, the number of commit requests to associated DST execution units corresponding to the write threshold number of favorable write slice responses received.