explore/support Swoole
I recently came across a new event lib like ReactPHP called Swoole (https://www.swoole.com/) with very impressive benchmarks:
https://gist.github.com/nkt/e49289321c744155484c
Basically, ReactPHP was getting about 1/2 the performance of NodeJS and Swoole was about 10x greater than NodeJS (20x better than ReactPHP).

I would be great if it was possible for Ratchet to support Swoole where it's available.

Why would I not just use Swoole natively?  I would prefer to use Ratchet so I can have a common interface where Swoole is not installed.  

There is a similar discussion in php-pm (https://github.com/php-pm/php-pm/issues/389) but I think with Ratchet the benefit is even greater because it's easier to reach a bottleneck with networking/concurrency (c10k).