Currently, RSSO has 5 OoB UserID Transformations: RemoveBMCDomain, RemoveDomain, RemoveEMailDomain, ToLowerCase, ToUpperCase
But what happens if you need to do two of the transformations?
My idea is simple, allow two or 3 of these transformations.
Then it would be much easier to use a couple of the OoB transformations - like RemoveEMailDomain & ToLowerCase. Which would save you from having to create a custom transformation.