Great start!

I couldn't help but notice this line of code:

$this->cache_exempt = apply_filters( 'epc_exempt_uri_contains', array( 'wp-admin', '.php', 'checkout', 'cart' ) );

This implies that you can alter the array of cache exceptions. I could be wrong, but doesn't this line of code run before the theme initializes? I think plugins that are being loaded after EPC don't get a chance to hook into that filter as well.