It's usefull to have specific sorting for some specific folders.
For example, if you have a download directory, you may want to sort it by "last modified", when all the others folder are sorted by name.
It's probably the same that https://sourceforge.net/tracker/index.php?func=detail&aid=3307054&group_id=156956&atid=801867
You seem to have CSS turned off.
Please don't fill out this field.
This feature is implemented in current GIT sources for PCManFM.
Thank you very much.