Application too big for native resolution

I have a Macbook Air mid 2009 with native resolution 1280x800. But one of the application that I have too use for work is built for 1600x1050 as a minimum. And i cant rezise it or drag it cause its at the minimum size already. And if i force it into fullscreen mode i cant even then see all the buttons i need, some of them are out of the picture.

The solution i have come up with this far is an external monitor. But i travel alot. Cant drag a external on the plane and carry to the hotel twice a week.

Found that earlier versions of OS X had som scaling function you could use. But seems to be inactivated in 10.8.

Any ideas?