If liquid metal really is the cats meow then it should work better for low level signals. From what I understand it is a tin/mercury slurry, both of which are not great conductors, or i should say, not the best conductors.Most importantly, it contains no mercury, it is a tri-eutectic that has no mercury.
And the updated medical research (more than a few studies done as of now) on these eutectic blends, this data says the toxicology is zero... none ever found.
http://www.rgmd.com/msds/msds.pdf