I would like to se you can add and map a .jpg to the rendering fx. logo's
I understand the question, but as a workaround you could use a modeled plate where you texture your logo? this way your logo is in the same light as the model?
or you can use a free (paint.net) photo editor to paste it on?
or you could use a backplate with the logo in?
but again, I see where it could be usefull