If the PS4 can have sprint mode, so should the PC. I expect the remastered version to come to the PC by the end of the year, but until then here is a tool that allows Rush to sprint plus a couple of other features.
I do not have a PS4 - most of my information about sprint mode has been courtesy of Atmaone and some from the PS4 board; he ran a timing run for me so I could match the PS4 speed on the PC. He made a quick (not extensive) test of this yesterday and pointed out an error regarding button mapping, and suggested a toggle mode would be useful. The tool allows choosing either "Hold" the left shoulder button as on the PS4 or toggle the shoulder to turn sprint on/off. It will likely have some differences, but the big thing it gives is the same 2x speed for most exploration.
The tool also allows battle animations to be accelerated. I have seen enough Divain "mule kicks" and Spiritwoods farting/belching Silent Gas that I am interested in the battle results and not the graphics most of the time. There are still rare monsters I have not seen, so I slow back down to see how the artists presented them.
In a recent run, the unique leaders really irritated me when many (a dozen, give or take) asked for materials or to go fight monsters. This tool can shut up either talk - it does not affect focus questions.
The zip file contains both the .NET 35 and 45 versions:
http://www.mediafire.com/file/lld7hgh0pkp1s4v/SpeedBooster.zip/file
md5 sha1 file for verification:
https://www.mediafire.com/file/z62rnr28fi8qwre/SpeedBooster_md5_sha1.txt/file
Status: Retired.substitute("ir", "ard")
I've forgotten everything I knew about whatever it was I did for whoever it was I worked.