Actually entire idea is in the title. Anyway below I tried to explain it in details. And, of course it’s as raw as it can be so feel free to propose fixes.
A little bit intro.
There is quite small amount of packages in crates so obviously that should be changed. So the problem here is that devs actually may have some spare time for implementing something useful for community and on the other hand they actually don't know what the community want.
Simple solution to the problem
Create a page where people can ask community for implementing specified libraries and vote for this requests.