I'd like to see this as a native option for all users so +1 from me.
I've been experimenting with supersampling and the results are very encouraging.
I have a 1080p monitor and I can run 2160p with great fps (which is helped enormously by not having to use AA with the deferred renderer) and the in-game image is very sharp.
Couple of questions though....
Is supersampling 2160p onto a 1080p monitor taxing the GPU more/less/same than if I just ran 2160p natively on a 2160p monitor?
Is there any way to run DCS's ME/menus at native res while supersampling the 3D part? Currently they look rather blurry, even with 'scale GUI' ticked in the options.