It is weird how these skills aren't uncapped. I do wish they'd change rest however. For example, from rF-rA, you can choose which position you want to sit in. Then at r9, you learn a new one and so on. Actually, I've tried all the male human rest positions. I tend to most often do a LOT of slouching with the r9 rest. I do like one of the lower ranks though, the one you do when you wear newbie clothes. The rest position I often do irl is.....well, go find Naruto Opening 7 (NOT Shippuden) and watch how Shikamaru sits.
^ That seems like an awesome idea...imagine if when u press rest, a sitting position option came up would be awesome to be able to sit however you want to...