I understand how unRAID and traditional raid levels work, and no, currently there is no option for selecting the RAID level. Existing solutions, OSs and full appliances, offer the ability to choose from standard levels, and some offer a superior alternative (in our case, unRAID). I believe you are correct, unRAID is a superior choice in most cases. However it seems like these choices should be something standard in a NAS, unless they will never be viable or it simply cannot be done.