I saw this also and think it's well suspect!
It doesn't matter what gears you get cut you cannot make a 1:1 60series 5 speed unless you stuff with the shift pattern!
Std 4th (1:1) is the input shaft directly connected to the main or output shaft, you cannot get "gears cut" to change this as there is it doesn't involve any ratio changes via gears! However you can do things like get 5th remade to a suitable 1st ratio (still in the 5th gear spot tho) and then cut new ratios to fill in between your new first and the "new" 1:1 "5th" (actually old 4th and still in the std 4th gear position).
You then have to deal with shifting all the way across the gate when changing from "new" 1st to "new" 2nd.. Race car only stuff really.. Too much of a PITA for a roadcar..