Sorry, I can’t support that plugin feature officially while there are other plugins dipping into the data. I can take a look and see if I can offset what they’re doing, but that’s a fairly substantial time investment, which then must be maintained as that plugin develops and changes.
Limiting by IP address is a non-scalable approach to security. I may or may not have given you this link before now, but I outline here why banning IP addresses are not a valid path to security:
https://www.icontrolwp.com/2014/06/beware-new-security-theat-wordpress-misinformation-virus/
Sorry I can’t be of more help, but unfortunately developing, supporting, and trying to ensure your plugin works on all web hosts and with as much compatibility as possible is a near-full-time endeavour. But also then playing with other plugins that meddle with the very data+flow you’re also working within, is almost impossible.
If you trust limit login attempts to handle that side of your security, you should use it. You can just disable that login protection/user management section of our Firewall plugin and you’ll be fine.
Thanks,
Paul.