You haven't seem to notice, F-4 has been in DCS at least ever since LOMAC days as an AI to play with. So definitely not strange to our community or DCS. It will probably one day be designed as a fly-able, however not anytime soon. It has been on a wishlist by many, but multi-crew DCS code has not matured yet. There are plenty of aircrafts in the process of making (beta) and in early development phases, and quite small 3rd party community where most don't even do it for the living but as side volunteery jobs out of passion. We will be quite bust next year with Hornet and Tomcat early releases. Where Tomcat will basically push the envelope by adding multi-crew code on the next level, something that's necessary to make sure F-4 works.