Add ability to create full-context, all-files code review from two URL paths and a repo revision number

Similar in purpose to http://tortoisesvn.tigris.org/bigpicture.html#dirdiff

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Example Scenario:

t0: starting point, project_a is on trunk
branches/
trunk/project_a

t1: bug found, bug fix branch created for project_a
branches/bug_fix_project_a
trunk/project_a

t2: some bug fix changes committed to branches/bug_fix_project_a

t3: some unrelated changes committed to trunk/project_a

t4: changes from t3 are merged into branches/bug_fix_project_a

t5: more bug fix changes committed to branches/bug_fix_project_a

t6: at this point, branch is ready for review, i want a full-context and all-files code review between head of trunk/project_a and head of branches/bug_fix_project_a
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In the example above, I want to simply tell Crucible "make me a code review which shows all files and full context between http://my_svn_repo/trunk/project_a and http://my_svn_repo/branches/bug_fix_project_a at repo revision x". I wouldn't want the changes from t4 in code review.

That feature would really help my team since most of our work occurs in "feature/fix" branches and is only merged in after review.

I realize that this new feature, if accepted, would take some time to complete. In the meantime, can you recommend any tools which would allow me to create a full-context all-files patch file from the input parameters I described?

Thanks,

Luke