In real applications, you'll have to still be aware and program to the Eventlet API since, for example, an Eventlet queue or greenlet pool are different than gevent's. Other than making the core Ginkgo API work, I don't think we should invest in trying to adapt Eventlet behave like gevent.
The advantage of supporting Eventlet is being able to write and distribute apps that don't have a dependency on libevent (or soon libev). I'm going to see if I can make this work for Requestbin and Localtunnel v2, since they are both intended to be installed and run locally.