The Detailed Device Report cannot be customized. You can, however, use the Data Extraction Engine from the CLI to export the detailed inventory to an XML file, then parse that XML file to create a report that only has the data in which you are interested.
For example, to export inventory for a device, 10.1.1.1:
NMSROOT/bin/cwcli export inventory -u admin -p admin -device 10.1.1.1
The elements within the exported XML that correspond to interface state are (corresponds to ifAdminStatus) and (corresponds to ifOperStatus). The last state change time is stored as an attribute of the element under the element. For example, a full interface block may look like:
7
ATM2/0.0-atm subif
atmSubInterface
256000.0
up
StoppedOrSuspended
ATM2/0.0-atm subif