I really like the idea. And actually, I like it even 3 years ago when lfryc raised the same topic and wrote a bachelor thesis about subject - Arquillian RushEye ;-). I believe now with Arquillian Recorder provided by Stefan Miklosovic, it would be easier to implement than ever.
I think this is a feature of Graphene. Drone just spawn browsers. You can use plain WebDriver or whatever else we (or user on it's own) implement support for, if advanced features are needed, go for Graphene. Recording itself will be put to Graphene, so visual regressions should go there as well.
Ouch, you were quicker. I should not type so many words next time ;-)