This might be a long shot, but once career mode comes out with a tech tree and some R&D mechanics, I wouldn't want to be forced to use stock parts only (at least not until ClairaLyrae's complete KSPX set, including the unreleased parts become stock). I'd very much like a quick and easy way to integrate mod parts into the tech tree, whatever it might look like. This means assigning them to a tech tier and giving them a price, monetary or resources. Sorry if this is too off-topic.