Fairly simple request. Half of what makes Contacts what they are is currently missing. We can only contact from Avatar to World to trigger something in the World. What we need is the ability to send parameters from World to Avatar to trigger effects on the Avatar.
An example of this would be a weather system. You stand inside a contact for rain and it will send a inRain parameter to the Avatar which then can implement something in their animator layer to do something with this, such as enabling shader effects to look rained upon or wet.
This could be used for many effects, sandy in the desert, muddy in swamp, wet in rain/water, damaged/bloody in games with health and so on. Allowing communication from the World to an Avatar would open up endlessly more ways to interact with the World in a variety of ways.