I would like to criticize on this policy:
http://pages.ebay.ca/help/policies/listing-javascript.html
And not so much the policy itself, but the enforcement.
First of all the JavaScript replace() function is not used only for changing the URL but it's a general purpose string manipulation function. I used it hundreds of times and only few times in connection with URLs.
Any seasoned JavaScript programmer can write replacement using either regular expressions or strpos/substr.
So why is this function restricted is beyond my comprehension, because it's not stopping anyone who wants to break the policy only making the life of people who don't want to break the policy harder.
As for manipulating eBay content - I have encountered listings that change the colours or fonts of eBay content and nobody was policing them.
