If you think your TCU supports that mode, you can change the logger.xml file to enable the option.
Edit the logger.xml file you are using and change the value circled to true. Save and start up the Logger. The option should now be available to select. If it works, great, let me know.
It's possible that old TCUs don't support it but newer ones do. Overall, TCUs have had limited testing when it comes to logging.
Attachment:
tcu_fp.png