I have high resolution images that would be much more effectively executed in landscape format. Is there a way to tell ConTeXt to automatically place images in landscape format to suit their dimensions when fitting them to a page?
I don't know of any automatic method, but what you can do is to define a custom style for the images that have to be rotated and use it for big images. Example:
Whenever you want to include a big image that should be rotated, you add another pair of brackets with the identifier (here