The current Science System is nice.... but it doesn't take a whole lot of effort to max out the tech tree. But it would be nice if there was more Research Facilities out there that could be used for secondary goals. Creating an Exo-Kerbin Base would be amazing. Launch a research module, Hydroponics bay, telescope, habitation module, Kethane Miner type thing, +25 Kerbins & boom, You have an Extraplanetary Launchpad. But that's my pipedream. Getting back to more realistic things, it's dumb there is no Experiment Storage Module. Only being able to return one surface sample / materials study / et al is unrealistic. There should be a module where you can store a quantity of completed experiments for Kerbin return.