We have nothing to do with the entire settings portion of the XR routers, that is down to Netgear. For example the DHCP issue is a bug that they are fixing, they would not need anything for us in order to implement this in a new firmware - they could use the existing build together with their changes/fixes.
I haven't got any specific stats for you but the cause of slower speeds on the R1 with PPPoE was due to hardware limitations, so as the R2 is more powerful this will be improved upon.
Thank you so much for the support and for the kind words. We're sure you'll love the R2!