Yesterday I mentioned that BBFileScout added the ability to resize your images from your BlackBerry. Todd let me know that they have released a slight upgrade to version 184.108.40.206 that adds the ability to resize images to a custom size that you set!
The new Image Option section has an additional entry in the target resolution called User Defined.
You can read more at this link or download the app OTA here. The app is free to download but the developer is asking users to donate as much as they think the application is worth.