Wallet software could implement that yes. Or one could manually reissue larger “coin” inputs into smaller, or vice-versa. I envision that a wallet would present a list of “bills” or “coins” and one could select one or more of them and then click “reissue” and specify 1 or more output amounts. simple as that.
yes absolutely. If this thing takes off there will doubtless be a ton of documentation available, just as there is with bitcoin and clones today. Anyway, these writeups are a first step at information dissemination, and also anyone is free to look at the code, and the API docs. At the moment we are in an iterative design/code phase and api’s are in flux, so it doesn’t make sense to be writing detailed docs as yet.