We are limited to the runway type, lenght and orientation that were originally included in F4.
Amongst them we can play.
But for the moment, we cannot create new orientation.
There is a project going to lenghten some runways but nothing definite. I believe Chris is working on that.
The airbase list spreadsheet have all real world data regarding airports in all F4 theater. Latest version can be found on that link
http://www.candyparty.com/ST/SP/Airbase_list.zip
Cheers
RD