coursepress plugin instructor link

This plugin creates an instructors link where the public users are taken to view all courses provided by a certain instructor.

This exposed the instructor's login name in the url like :
websitename/instructor/userloginname

Can this page be completely hidden or disabled or change to show alias instead of login name?

I think that exposing the login name of a user is a security flaw.

I use insanely long usernames in wordpress but this renders it useless.

Please let me know if you have solution for this already or which files i need to edit in the plugin to remove the author information.

Best Regards,
Taku