HTTP(Network Server) MIME Types missing

hi

i would like to use SSE(Sever-Sent Events) with VVVV.
http://www.w3schools.com/html/html5_serversentevents.asp

somehow the HTTP(Network Server) node is missing some MIME types
and one of them is the key to serversided events.(text/event-stream)

since i don’t think its possible to cheat the node and give it a custom MIME type, would it be possible to make an advanced version of the HTTP(Network Server) node, with a siple string input instead of enumerations ?