I would prefer that the Help link be renamed to 'About this software'. The Help link could be kept so long as we have control over where "Help" goes. Let us dictate what the URL goes to. A 'user-defined' field (and label) would be nice too.
As far as the right-click menu in general, I would like to see where each menu option can be displayed or not, including the 'About' link I just proposed. When a new tour is created each time it can simply display the 'About' link by default. Then we can make the call to display it or not.
I understand Easypano's decision to have some linkage back to their site and I do see value in that. But keep in mind too that a precedent was already set in to motion for years now that your customer base has come to expect. To all of a sudden force the linkage upon future software products is not sensitive to customer expectations. Remember, we are your customers and we have customers that we must answer to as well. Some of us have contracts or atleast customer expectations that may have been established over time and may find it hard-pressed to sale our customer that a 'no external links' policy in the tours they paid for is no longer an option.
Just something to think about.