There are a couple problems with this that make it very difficult to deal with from an administrative perspective, not the least of which is what is the correct maximum size? There are lots of different screen sizes out there. And the plugin that would resize the images on the server side is much more likely to break the site than help it.

The solution that KVS provided is what we've been having people do to deal with the problem. If there are images that are unduly large (and they are RBP'd) moderators will remove them to protect the layout/loading of FlyerTalk.

Here's the question...why change the policy rather than just resize your images when you're posting them? Having images in the fora adds great value to the site, IMO. Revoking that would be a bad thing.