Oooh, some interesting ideas you have there.
First, there is a currency system already implimented, it's shown under /whois/whowas and is called Moneys, but right now it has no purpose. Suggestions can be made for purposes if you can think of some.
Second, /getrank is a quick script which is built externally. I will be implimenting it into the software next release (67.3), and will advertise the operatorship applications under a new variable.
Last, that's a good suggestion, but somehow I don't see leaves containing water. I may consider removing them, or replacing them with something else, but that is true. You can jump into it, but then not jump out. Even i've had this problem. I'll get on fixing it asap. ^^