The specific files are in the forum directory '/includes' and they are class_bbcode.php and class_bbcode_alt.php. They're commented so you should be able to see what does what.
Quickly browsing through the file class_bbcode.php I noticed a function handle_bbcode_img. It returns the string with the bbcode parsed. If you remove the contents of the function, and just leave the return, whenever the function is called it should just return what is supplied. This would leave [img] codes visible but keep images from showing. If you know how to use preg_replace you could strip the [img] tags so they don't appear at all.
I've only glanced at this function for about 10 seconds, so don't make any decision without checking it through yourself first!
Backup the files before you remove anything though.
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