I can see the plugins, I just can't control which ones are active by default.Sites hosted on WP.com don't have as much admin control - WP.com updates everything as updates are available, I think. I'm not sure Tony can even see what plugins are being used without digging.
If I were running the business, I might be willing to pay for hosting which would give me more control. However the owner isn't interested in investing the money and I've already donated my time for free - I'm not going to put more of my own money into the project.
The idea of a website with extra content for registered students sounds cool, but I don't have the time or energy to put into creating that content. Maybe if I won the lottery and was able to quit my day job ...