Fit Window if bigger then player

[FrozenChaos]

I'm having a small problem playing 1080 videos. The videos are so big that they don't fit on my window/screen. The only way I found to fix this is by clicking (Always Fit Window) but doing this scales all my small videos to fit the window too.

Is there a way to automatically shrink large videos to fit your window/screen while not scaling smaller videos?