Freely stretch aspect ratio
 

An option to freely 'Stretch Horizontal' and 'Stretch Vertical' would be much apreciated! Preferably with hotkeys.

In Koala Player there is such an option. CTRL-UP/down-arrows stretches vertical. CTRL-Left/Rigt-arrows stretch horizontal.

I fail to figure any situation in which such behaviour would be useful :?:

I use it constantly. I mean, I probably use it for almost every film I watch.
It's usefull if you want to stretch the picture so that it fills the entire screen, without loosing anything outside the screen.

Like ctrl+num arrows ?
That should be enough for you ?

ah, great. tnx for informing me. =)

But how can I stretch back again?

You'll never gues ! Ctrl+numpad 5