When I first started experimenting with slides, I very quickly realized I could put in more "shortcuts" than I could remember. Then I would have to hunt for the right shortcut. This was a bother, and ended up wasting more time than it was supposed to save.
I chose North for uppercase, since it works with the regular Keyboard input method, but the purpose is the same as your intent--always make sure the capital letter is available as a single "stroke". I find this particularly useful when entering passwords.
Several other (non-Fitaly) input methods emphasize the importance of accessing vowels. I made a simplistic analysis of a few of my (non-PDA) documents, and found it was true--most of the time, consonants are followed by a vowel, rather than another consonant. And, most words end with a space, and a small fraction (~15%) of them end with punctuation.
Then, when I saw a post here about how the slides are stored in a file, it was just a matter of getting in there and putting in the entries. For the first pass, because there were so many entries to put in, I exported it to the PC and worked with it there.
--dang