I'd perhaps only half-noticed the lower-case in the main text, and certainly not in the section headings, but what I had noticed was RISC OS with the large 'R' and smaller 'ISC OS' (all caps), that's got to take some effort?. None of it bothers me though. At the SE show, Jim was asked about the e.e.cummings style and put it down to having to scribble notes on punch cards in ages past, but looking at the pages shown above, he has used capitals for all the names (6 times in 8 words for Andrew Bissex...), so why not at the start of sentences and for the 'I's?
I guess it's just his style, so no problem here!!!