The rectal balloon is used in proton RT. I have never heard of if being used in photon (which is what I had - IGRT with Calypso markers). Understanding the process, it would add time and discomfort, so there is likely some trade-off. Statistics would raise their ugly heads again....
For the urinary side, my uro says that he can, as a last resort, use a laser to cauterize the damaged areas. I've not had a colonoscopy since surgery.