Instead of having to have # different contact tags to cover a bunch of integers or floats, it would be really cool if a contact was able to transmit a value to a receiver. For example, an avatar I use has a tennis ball with a float controlling the hue. This ball has a contact and constraint system to be able to be "passed" to other users in the same avatar, by enabling their gameobject and disabling mine. One issue though, is the colors don't match up. I can see this having many potential applications for friend groups and communities.