Add support isp.peer_policy like in uTorrent/BitTorrent. This feature much better than retracker, because it autoselect and prioritize local peers from list. Users with Gigabit connection can use full speed in local networks, instead limited 100 Mbps. Also, this feature don't pressing ISP with bad packets like with option Local Peer Discovery.

Example of peer_policy.xml:
weight = priority from 1(min) to 10 (max).

<!--
 Common description
-->
<btpolicy version="1.0">
       <revision>1.0</revision>
       <oper>ISP Name</oper>
       <!-- Private networks -->
       <iprange start="192.168.0.0" end="192.168.255.255" weight="10"/>
       <iprange start="10.0.0.0" end="10.255.255.255" weight="10"/>
       <iprange start="169.254.0.0" end="169.254.255.255" weight="10"/>
       <iprange start="172.16.0.0" end="172.31.255.255" weight="10"/>
</btpolicy>


Screenshot form uTorrent: https://i.imgur.com/VxKKFF5.jpg

Thank you for patience.

Possible mark the peers from user list of ranges as local peers, instead priority.