Nicely described theory on superhighways in space.They would have to use 'subspace lanes' to get anywhere with reasonable speed. Which would limit their movement to places that would become important 'core' territories by TOS.
That would help explain some of why things are the way they are in TOS. Why certain civilizations were encountered first. Why some areas of space are more populated. How primitive warp vessels could end up so far out in TOS.

Similar to the idea of "subspace lanes", I have galactic magnetic ribbons/tubes/storms floating in interstellar space that can be entered and rode at increased speeds while at warp. The strength and length of these magnetic ribbons yield some with higher speeds and others with longer distances. Conveniently. many of the magnetic ribbons are stretched between the large magnetic fields of stars, so, travel between some stars is much quicker (such as Earth and Vulcan) than travel without a ribbon. Finding and mapping these magnetic ribbons is key to high speed warp travel; this is why obtaining the detailed space charts from the Vulcans was important. YMMV
