There are gazillions of examples to mention: Sickth (sixth), drorring (drawing), etc. in single words. Expressions also like "It is best for my husband and I to..." - separate and it becomes obviously wrong: "It is best for I to...."; "He may not have died last week/month/year if he had been wearing a seatbelt" - (instead of might) from which one might assume there is uncertainty as to whether he is dead or alive.
Never. It doesn't make sense. Same as you can't use the word 'their' for someone of doubtful sexuality. I know whereof I speak, my god-daughter is now my 'godson', sort of. Much as I love her/him, I couldn't use a plural pronoun for a single person - and 'it' isn't appropriate. It's tricky.
I find 'Intregal' amusing. Also if the working man can pronounce 'Brewery', why can't he pronounce 'February'? (That might have been Bertrand Russell.)
Jim, I think they are both taking the easy way out; some things are difficult to wrap your tongue around; that's why language changes over time. I guess we oldsters have to accept these things.