The whole "no download" thing on Flicker is a joke anyway. It's easy enough to bypass if you know what you're doing. If an image shows up on a webpage, you can always isolate it and download. It's just the way HTML works. Best thing to do is like you said, keep the resolution low. Use PS to "Save for Web" before uploading.
Mark - Randomography
"The $0.99 menu was put on this Earth for a good damn reason." -Weebl