The porn thing is that you won't be DFed for habitually viewing porn unless it's hardcore stuff.
This is what the Sherherd book says under the section on what constitues porniea (i.e. cause for a JC to be formed)
An entrenched. practice of viewing, perhaps for years, abhorrent forms of pornography that is sexually degrading. Such pornography may sadistic torture, bondage, gang rape, brutalizing of women, or child pornography. conduct would be involved if the was promoting such material, such as inviting others to view it, thus giving evidence of a brazen attitude.-w06 7/15
I am sure there is something somewhere which I can't find right now which suggests that an appointed man can remain in his position even if caught viewing porn if it can be established it's a one off. I might be wrong on this - can anyone clarify?