File comparison in pane below directory comparison?

When comparing directories, it would be nice to split the main window horizontally so that the lower half shows the file comparison for the currently selected row, rather than opening a new window for each comparison.

For large files, the lag between opening the file comparison window and the results actually being shown suggests that the interface might not feel very fluid like that, though. I’m not sure if caching or preloading could help enough to make it work nicely for large source trees.

Anyway, I think something like that would make browsing changed trees much smoother and it’s my main use for Changes! :)