I have the latest stable version of L3DT (16.05) and it's not the best for UE4, works flawlessly with Arma though, my other choice of engine.
My renewal is now due but I've lost interest in Arma so I'm hoping for UE4 support, previously the scaling was off, edges we're stretched due to the supported UE4 resolutions.
Also @ Aaron, if you do read this, I tried emailing you last week but no reply and I can't send a PM because I'm new.