Basically, the idea is to allow the user to set the track width in mil on each Wire directly in schematics (or equivalently set the maximum current in amps). In PCB editor autorouter feature could automatically get this value and adjust consequently the track size, , if "width" field is unset the wire will take the default autorouter's width. This would be a very useful feature because usually tracks transporting power should be thicker than tracks dealing with signals; as for now you have to go into pcb editor and set manually the track width for each wire and when dealing with complex circuits it can be too cumbersome.
