Is it possible to override the default property of WriteCreationDate to WD_No or either WD_Current using the Custom user profile?
Yes, this is possible.
By default WriteCreationDate has WD_DocumentContentInfoOrCurrent property, more about it can be found here: WriteDateEnum.
However, we can override it to the desired value using custom import profile with the specified property:
WriteCreationDate = WD_No
More information regarding custom profiles is available here: Working with Profiles.