ok, that's good to know. usually in this type of situation, where different systems are being interfaced, it is necessary to define the underlying structure of the generic interface and to then create plugins or extensions of some kind that work for each framework or platform that is going to be supported.
it is because of the need to create a generic layer that plays nicely with steem that it would be nice to have input or help from the core devs.. there is no way to know if the layer will be optimally designed without knowing their intentions. maybe opening a github ticket would be best.
i just looked through the steem api docs I found through a search, but don't see any mention of a command to perform a post: https://steemit.github.io/steemit-docs/#introduction