Using login inside password for FTP

Hi,

Even using a "very-low" password security policy, I can't use the "login" value inside the "password" field when creating an FTP user (I know it's bad, I just need to).

Is there any workaround to do so ? By using command line for instance ?
Or would I need to download an FTP program and do this on my own outside of PLESK ?

Thanks