Any lack of user functionality should be attributed to the lack of a command processor. A suprisingly large number of people will believe that you have thought in depth about the issue to which you are alluding when you do. Know how to blow any problem up into insolubility. Never hit someone head on, always sideswipe. Idiosyncratic indentations, double-spacing, capitalization, etc., while stamps of individuality, leave one an easy target for parody.
Strong language gets results.
You can always say the latter in a later paragraph. The entire life, times, collected works, expressions, and modalities of Zippy the Pinhead are a common ground for much of the metaphor, rhetoric, and invective which pass daily through the mail. So will puns and other remarks addressed directly to the point. When replying, it is often possible to cleverly edit the original message in such a way as to subtly alter its meaning or tone to your advantage while appearing that you are taking pains to preserve the author's intent. As a bonus, it will seem that your superior intellect is cutting through all the excess verbiage to the very heart of the matter.