This is something I hadn't thought of, but I don't think it would be out of the question... Right now it just indiscriminately fills every storage container (fuel tanks, batteries.. etc). Running on the same present that it does in it's current state, I think it could be molded to add extra weight to certain parts. I can see how that could even be useful for 'simulating' test flights as if they were on different planets/moons. Increase the mass of a lander by x% so you can test launch it straight from the launch pad. I'll have to think on that some more. Combining a few of these types of things could end up with a pretty nice test flight suite.