Yup pretty much like that. I have a more complete sytem in mind (This rpg is somewhat simple in terms of manipulation but like world of Warcraft or warhammer when it comes to the rules LOL but IMO it is actually looking like the most in depth I've ever seen.)
The system is basically If you train clones (bunshins) several tomes then you can do it for 10 less chakra, like the scroll. (The scroll is for newer players)
If you train summons or make yourself more friendly with them, you can summon them for 10% less chakra.
And so on. A complete list will be done in the near future. It's very exhausting to do all o this but only I know what I'm really doing lol (wish I had an URL friend that was active to help me out)