I have in several occasions had DRC errors because nets which are connected through jumpers or ICs does not appear electrically connected to KiCad. Especially for 2 layer boards, 0 ohm resistors are useful when crossing wires. Sometimes its easy to include this in the schematic, the jumper splitting a net into two separate nets. But it might be hard or unpractical in other cases, such as bridging a power wire through a 0 ohm resistor.
My proposal is to add a virtual copper plane to KiCad. By this I mean a layer where we might route together the nodes of the jumper, indicating to KiCad that there is an electrical connection between the nodes. Or route together VDD pins of an IC, indicating that they are internally connected and its not necessary to connect all pins. Of course if it’s mandatory to actually connect the pins in the layout, we wouldn’t use this proposed feature.
I mainly see the benefit of this when using jumpers, 0 ohm resistors, connected wires, and such.