Would be nice to be able to reference dates by variables. For example: Today.
One use case might be if a user will change group based on a user-defined field.
Let's say this UDF is called Probation period end date. If this date is passed, the user will be part of a different group. So the criteria for this group will be : Probation period end date BEFORE Today. So a user with a Probation period end date that is before today will be added to this new group. Other use cases for this functionality are also possible.