Probably in the minority, but I would like to see a less colour-intenstive layout (at least as an option) for the PDF version, at least. This is a problem endemic generally for all wargames rules books - Paizo have often not been any better, printing an adventure path[1] wastes a lot of ink even in grey scale because of the apparently universal daft idea to print coloured backgrounds on everything, particularly. Nevermind printing, reading PDFs on a regular, non-colour kindle can be a pain, and if I play somewhere other than the house (which has, granted, not happened in years) I either still use BMR or copy stuff into word documents, because there's way too much background colour and wasted space in Total War (or even BMM) for me to ever consider even printing bits of it. Hell, a straight-up kindle version bundled with the PDF was be better in this day and age. BMM is definitely better in this regard, but I recall at the time I bought Total War, it was particularly egregious.
Frankly, the greyscale layout used in the TROs would be a huge improvement and I feel even that is sometimes excessive.
Colour absolutely has its practical place in stuff like tables or heading and such (and its omission is, I hazard, a probably nonfactor in terms of printing costs these days), but toning down the saturation - at least as an option - would definitely be favourite from a utility aspect; I'm a great believer that rulesbooks should serve their practical function first and art a very distant third or forth place. I am not interested in coffee-table books, personally, and absolutely not for a game I actually play.
Again, I know I'm probably in the minority, but...
[1]Because buying hardcopies is nowadays just a straight-up non option. Last time I even looked at it, Pazio was having a 50% sale and it was cheaper to buy the PDFs at full price than the hardcopy at 50% solely due to shipping.