Please integrate CSF (ConfigServer Firewall), It a very good firewall which gives you a tips what to do and how to secure your server. I will be very happy to see this.
I am freelancer as linux system administrator and I'm using your panel because of couple reasons
1. Its free
2. Its powerfull
3. Its unstable yet but i am doing my patches to make it more stable
4. Open for making a custom plugins, I have made couple plugins and testing them in my local srv.
5. Easy to manage, most of my clients has no idea even what is linux and thay learned how to manage.
I have installed more then 24 porjects with aaPanel.