It was supposed to be fixed in EA 3.12. Unfortunately it wasn't fixed as we can all see. I opened a ticket at cpanel and the person i spoke to, told me that he communicated with the developers but he had nothing new to tell me.
I believe that cpanel team doesn't pay much attention to this bug, because they think that mod_ruid2 is a better solution at the moment and officially supported. However a smooth transition from mod_fcgid to mod_ruid2 is not guaranteed, there have been some reports with mod_security problems among others.
Personally i will keep mod_fcgid around a bit longer, even with the kill command running every 5 minutes, to get rid of the abandoned processes. I have my hopes up for upcoming php-fpm support.