Add revision from different branch

If I have a file on trunk in subversion at revision X, and I create a branch, and the file undergoes changes on that branch and is at rev X+N, there doesn't seem to be a way to make Crucible have both revisions X and X+N in the same file side-by-side view. Rather, Crucible has one file on trunk with revision X, and one file of same name on other branch with revision X+N. Very impractical. Subversion provides such diffs (just open the revision graph and select any two nodes) so there isn't even any work for crucible to do, if it can delegate the diffing to SVN.