Wasn't really sure if this should go into mods, suggestions, or question forums so I'm just going to throw it here for now.
Is there a mod for fuel switching? I'm starting to design a new spaceplane that's going to be exclusively for space, and I want to make it ion-powered for a sort-of low-signature SR-71 meets EA-6B Prowler sort of plane. I'm still looking at exactly which plane parts I want to use, but with either mk1, or mk2 plane parts use either LF or LF+O, and even the smaller engine shells hold the same. So to make my plane exclusively ion, means I must use radially attached xenon tanks, and then figure out how to properly conceal them, without making it ungodly hard to refuel the spaceplane.
On a side note, wasn't there a fuel mod that allowed you to set relative fuel priorities? Something about fuel automatically 'flowing downhill', so you'd set fuel tankers relatively high, stations somewhere in the middle, and everything else low, so upon docking to a station you auto-refuelled? I can't remember the name for that, but it should help me with refuelling hidden xenon tanks.