I use higher speeds on less important roads. This gives me a route with a chosen trade off between calm and time after choosing the fastest route. In Navigator Free it works only for the first about 130 km the latter part of a route there is on main roads or it's car-like from the beginning.
Yes. I use portable battery charger for 5 years. It has to be a lithium battery to give enough high voltage to charge lithium battery in a mobile. I put my mobile and my charger in my waterproof bag on my neck. I've threaded wide plastic strap because a string caused pain. I rely on voice commands. I haven't found durable bike mount (for example aluminium) with possibility to attach a charger.
There are several gizmos for charging mobile devices from the bycicle dynamo. There are some rather extensive articles on that topic in German language on the internetsite http://www.fahrradzukunft.de