If you do "image-display image", and change options in "image-image range" you can see what is going on better. Also, "image-use image ratio" is what I was talking about above, but its sort of weird to use so I don't.
The advantage is for long slender objects that need to have a texture with less UV seams it's easier to pack them into a rectangular space instead of square, weapons typically fit into that category. In Maya, in the Uv Texture editor under 'Image' enable 'Display Image' and 'Use Image Ratio'. edit: faces tend to be 2:1…
The Display-image-ratio thing seems to work fine, I will go with that for now. If there are any more problems concerning this I will post here again. Thanks for all your help :)
I dunno if it's changed in the latest versions but i found it much easier to work square and then cut it down and scale the uvs after. All your translations were warped out by the image ratio.