viewport rendering and resolution

[crackfox]

hi,

i enjoy using the viewport rendering.
one issue i have though is that the output is tied to the aspect ratio under the render settings.

that way the upper and lower portion of the viewport, that are outside of the aspect ratio (16:9 for example) are not actually rendered but in their wireframe form.

the question is:
is there a way to render the full viewport independently of the resolution and aspect set in the render settings?

thanks