Yes, the outputs on the ezCAN use PWM for setting the brightness of lights. Of course, this won't apply to an output that is configured for a horn.
We do plan to make more channel configuration options available in future, so please send us your requirements so that they can be considered when making those decisions. It would be best to use the contact details on the ezCAN web site:
http://hexezcan.com/contact/When you receive your unit, you'll notice it does not have a USB connector to which you can attach your phone. The USB is only used to configure the ezCAN settings, yes.
In principle, the accessory output on the ezCAN can be used to charge your phone, but you'll need to connect an appropriate electrical interface. For example, you can wire a car cigarette lighter socket to the ezCAN output and plug in a car USB charger.