Mpph264enc gst plugin

Hey guys,
I am using the mpph264enc gstreamer plugin and am being baffled quite a bit since it seems that there are no bitrate related options available and everything is hard-coded into the plugin.

Am I missing something? Is there by any chance a fork of this plugin that anyone knows of with this functionality added? An encoder without bitrate related options seems pretty useless to me, that’s why I am thinking that I must be missing something.