I just found an answer to this and thought I would share.

Problem:  files uploaded to our ftp server are date sensitive to the time uploaded and our user's ftp clients are sending the MDTM (Month/Day/Time) command that changes the create date of the files on our server to whenever they created the file locally.

There is no current way inside of WS_FTP Server v.5.0 to disable or restrict the MDTM command.

Solution:  We are running Checkpoint firewall and it has an option to only allow certain ftp commands and we took out the MDTM command as one of the allowed.  This works, but on global level. 

Request:  Ipswitch, can you make this command restrictable at the user/domain/global level in a future release?  This would help us out greatly!