This was thrashed around a couple of weeks ago somewhere else on the Forum - but I can't remember where ! Probably one of those strings which "wandered" off the topic !
There are lots of problems with the grades ;-
1) they start at a ridiculously low level (who would want to start someone on MTO1 unless they were just an EBME Porter ?)
2) They are too short and there isn't enough discretion to allow you to reward good people.
3) There aren't enough usable grades (ignoring MTO1 & 2 as being an insult to offer anyone)
4) An MTO6 (or even a 7) would be nice !
Dream On !