it would be to time consuming to make an interface to drop or add rules dont you think? If you know what suricata is and are thinking about rules you probably can do it yourself through ssh? Just a thought. I mean, a gui would be pretty 
if you think it is doable, but the way suricata imports rules im not sure. Heard of aanval? https://www.aanval.com/ its free for a single sensor, Ive got that installed currently and am in the process of figuring out how to tie it into suricata.