although the technical features mentioned already are important, I think that the people behind the systems are just as important in such a situation. When I say to someone whose job it has been to create something (in this case a web site) that there's a better way to do this, then the chances are that this person feels a bit criticised - regardless of whether that's rational or not - because his solution isn't good enough any more. We people just tend to be that way.
I don't know if your current decision maker was responsible for either making the site or the decision to make it the way it is, but I think the problem here is, "How do I bring the decision maker to see that it could be in HIS interest to review the web site?" This probably means that you will have to try to 'arrange' the situation so that it looks that he - and not you - gets the cudos for any change. Become (in his eyes) his ally - not his critic. Once you've become his 'trusted assistant' then you can maybe get mor freedom later.
Sounds manipulative? - Maybe.
And yes, its a long and tiresome way but so is waiting for your next promotion....
Or you could start to go freelance in your spare time.
Good luck, the world would be a better place if all employees were as motivated as you are.
Alan