Decided to post this (I don't know if there was such a topic, but I could definitely not google anything on the subject) because I had lost some time fiddling with the dosboxBAK.conf file, trying to get the nice scalers working in fullscreen mode with aspect correction (aspect=true) on. Finally I got it working by setting output=ddraw and machine=vesa_oldvbe.

My personal preference towards the scaler used is supereagle for this particular game.

I hope that people can find this helpful.