paz AKA Matt Lewis
Going gentle into that good night
Badger badger badger
fix captions before they went to geekmod
You can already do this to some extent. Once you've uploaded your image, click the 'view' link that appears, then click 'edit' to allow you to change the caption.
I've changed it to 'OMG I've uploaded the wrong image, please reject!' or something similar on one occasion...