One new feature is going to be available as of next release 3.4. You
will be able to use a better resizing mechanism for article images,
which will bring much more control to how images are displayed in your
site pages. Besides that, zooming will be there for article images
too, as an option, so you will be allowed to switch it on and off
through system preferences.
We are still working hard on 3.4. So far, I have written a complete
(and hopefully understandable) HowTo on what you need to do to use
both features. You can see it at our Wiki page http://trac.campware.org/campsite/wiki/HowToEnlargeImages
At the bottom of the page you can find some attachments so that you
will get a better idea of what we are talking about