I flashed 'UPDATE-SuperSU-v2.02.zip' and didn't have a problem after.I think C-ROM uses "Superuser" app for root purposes. I have used this ROM for more than 6 months and never had a problem with titanium backup. The pop-up displayed by TB is only to inform you that it is more compatible with "SuperSU".
even so if you would like to change it I think you should download a flashable zip of SuperSU and flash it in recovery. Though I cannot guarantee that it will work as I have never tried it before and also doing so may mess up your device or you may lose root or have root issues later so do it at your own risk.
REVENGE SOLVES EVERYTHING
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