If you're running the review generation "systematically", I could recommend using the "ccollab" tool rather than the "ccollabgui" tool. You can manually provide the necessary details directly from the command-line rather than having to run the settings through a GUI. If you wanted advanced GUI modification, I would expect you to roll your own custom GUI wrapper to the ccollab command-line tool since the one already provided is just a simple wrapper to begin with.
For example I'll usually post a review as:
ccollab addgitdiffs new master...my_feature_branch
I wrote wrapper scripts that could take more or less options for my use cases, and if I'm uploading to an existing review I would replace the "new" keyword with the review number.
