Cool plugin. I'm experimenting with Quick Cache and this theme switcher. I've noticed with Quick Cache that I can designate which user-agent patterns to ignore: "Don't Cache These User-Agent Patterns". So far I think this is working. So far the mobile theme pages are not being cached, and also the cached desktop pages aren't being served to my mobile.
I'm using this list:
But I have limited data. So I'm interested to know if someone else is using this plugin with Quick Cache.