In Torque 3.3, the description of the attribute idMethod is
onUpdate (cascade|setnull|restrict|none) "none"
onDelete (cascade|setnull|restrict|none) "none"
There is no reason to have the explicit value "none". As with other attributes (e.g. attribute "default" on the element "column"), leaving the attribute empy is more intuitive than having the string value "none".
Therefore, the suggestion would be to change the definition to
onUpdate (cascade|setnull|restrict) #IMPLIED
onDelete (cascade|setnull|restrict) #IMPLIED
or its xsd equivalent.