TL;DR
Allow us to control which roboports belong to which network depending the connecting wires between them - just like how we control which electric poles are in which electric network.What ?
Roboports should connect to each other like electric poles - with a wire on the ground showing the connection. The connection is automatic like with electric poles and can be severed the same way as wires between electric poles - i.e. just attach a wire a second time between the 2 roboports.All connected roboports are considered part of the same network - with max distance between roboports being 50 tiles.
This replaces the less flexible proximity-based connecting of roboports to form logistic networks.
In addition, the wires could be allowed to carry power reducing the need for electric poles - if one roboport in the network is powered, the rest are powered as well.
Why ?
In addition to giving us tighter control over partitioning of logistic networks, it allows the overlapping of logistic ranges of separate logistic networks while still allowing the constraining of bots to specific networks, which I believe will open up more creative ways to use bots.Overall, I feel much more can be done with bots than the current logistic network building system allows.