Схороняю, чтобы снова не забыть.

Copy LaneSpeed.dll to your EXE directory and add it to the [Libraries]
    section of dacom.ini.  Requires & assumes the official patch.
 to adjust the speed, you also need to edit DATA\SOLAR\solararch.ini (which will also require unpacking it), look for Trade_Lane_Ring and add "lane_speed = [0..20000]" somewhere after nickname.