Something I'd find really handy would be to be able to embed variables/functions/whatever in the content as entered via the TinyMCE editor - i.e., treat this user-edited content as if it were an SS template. So, for example, the maintainer of the site could write whatever they like on the page but if they wanted a table of students in their page, they could simply type in $StudentTable and this would be correctly parsed as templates are.
2.4 will have tokenized content support for doing just this :D. I don't think it made it into the alpha but I think it should be in the 2.4 branch (if you use svn). Currently one of the easiest ways is just doing http://doc.silverstripe.org/doku.php?id=recipes:customising-content-in-your-templates, but thats not very nice. The token system will be more useful.