kaz²
Quiet is so relaxing!!!! >_<
Rail grinding wouldn't make sense considering many fences/thin geometry either lead to a wall or make you go towards a bottomless pit. There are almost minuscule exceptions (ex GFZ1 bridge) where it actually works in this sense, though it's redundant when you can just jump past it 5x faster. That system can be more a hassle than benefit, from kidnapping you when you're trying to save yourself, to just being near useless without a level designed around it.I know I just want rail grinding.
You'd have more luck custom designing a resource that level makers can use that melds with the level design, physics and fundamentals all in it.