Perhaps I should be more clear.
This is a free solution and I don't have support anyone with outrageous attitudes or accusations.
Fail2ban is not used by QuickBox... CSF is (feel free to actually review things included within the README). Fail2ban is nothing more than a dependency in the lineup for those that understand how to use IPTables on their own and/or create their own rules. CSF is provided by QuickBox to encourage a GUI for easier use to those that want security and reliability without digging into IPTables directly.
Saying that Fail2ban does not work in QuickBox and some devs need to address this is both moot and 100% arrogant on your part. We don't officially carry/support Fail2ban... thus if something with Fail2ban doesn't work for... you'll need to address this on your own.
You do realize that fail2ban comes default to standard ports.. and even then you need to add the ports allowed manually... it's not a Genie in a bottle.
Are you running a live E-commerce Production server, or a seedbox? You (again) need to look into the firewall that we have actually implemented to work with QuickBox... at the very least before you pass more accusations.