Erm... I'm not 100% sure we're all talking about the same thing...
I was expecting RR's to increase movement speed, as they have always done. ie: Road's increase movement by a factor of 2, and RR's increase movement by a factor of 3 (or whatever the factors are; I'm simply providing an example).
In my games, they are not doing so. Whatever the movement increase factor for Roads is, RRs have the same factor. So, if I were to lay out to parallel straight lines, one of Roads and one of RR's, units are able to get the same amount of movement along them both. So, if a 2-move unit gets 4 tiles along of Roads, that same unit is also getting 4 tiles of movement along RR's; whereas what I would expect is for that unit to proceed along more tiles in one turn when using RRs, 6 or 8 or whatever. Whether I use the auto-move function with the mouse, or manually move the units along one step at a time using the numpad makes no difference. I have tested this with Workers, Settlers, and various cavalry and archery units.
On long trips along the continent, I have not noticed the "go-to" function taking any weird routes or trying to avoid RR's or Roads or transitions 'twixt the two. Nor have the ranges of my caravan routes seemed odd, though I Have not directly measured them.
Edit: could I get a pointer to the post with directions of how to submit things to the GitHub?