Make ConnectionPool Interface Extensible for HTTPAgent

[hekike]

I'd like to be able to extend the ConnectionPool interface with my own custom implementation.
I'd like to implement a ConnectionPool that uses a predictive load-balancer algorithm (moving avg. latency + error rate penalty) instead of the current ~load based logic (available connections).

The new ConnectionPool would be heavily inspired by the following talk:
https://youtu.be/6NdxUY1La2I

Would you be open to making the ConnectionPool for HTTPAgent extensible?
I'm thinking about something like:

const mod_cueball = require('cueball');
const mod_restify = require('restify-clients');
const PredictiveConnectionPool = require('cueball-predictive-connection-pool');

var client = mod_restify.createStringClient({
    url: 'https://us-east.manta.joyent.com',
    agent: new mod_cueball.HttpsAgent({
        connectionPool: new PredictiveConnectionPool({...}),
        recovery: {
            default: {
                timeout: 2000,
                retries: 5,
                delay: 250,
                maxDelay: 1000
            }
        }
    })
});