That's a good question, I haven't actually noticed additional slide duration even with increased speed items. I believe that it does extend the distance you're able to slide but it hasn't been perceptible. Maybe I'm completely wrong and this is redundant. I feel like some method of reducing the...
I think that we need some kind of item that simply extends the slide duration, conserving your momentum for longer than default. The infinite ammo-on-slide mechanic is so brilliant and I would love to see ways to extend or play with it a bit more.