That bug has already been reported. It's just a pain to fix, and I'm working on other implementations of the "Recent Changes"
I was thinking about what it would take to build a website where a wiki is just one of the components. Other components might be a weblog, a bugzilla, a part with read-only web pages, etc. You would still want a single "recent changes" page for all these parts. All it takes is a standardized RC log file format (or database table) to which all components can add a line (or record) when an update is made. Since each component could use different methods to present a diff, the most general and flexible approach would be to let one field of the RC log format be a complete URL to the diff. Just an idea.
And an interesting one. The implementation I'm working on now does have a "recent changes" database table separate from the wiki tables themselves, so it would be easy to extend at some point to add other information sources into it. Unfortunately, the major problem at the moment is handling information overload, finding better ways to filter the information that is already too much for human bandwidth.