I can see both sides of the argument…
You don’t want sliding like in Warface, where sliding is the most annoying thing on earth, but also 100% necessary because you can’t get anywhere quickly without it.
But it could work in DB. Warface is really slow paced, and the maps are cluttered and covered. In DB, with its open maps and fast pace, it could work. One would just have to figure out a way to make it work, so that everyone isn’t sliding 24/7.
I think the best way to balance it would be to make it really dependant on the merc’s speed. In Warface, everyone had the same slow sprint speed, but a disproportionate ability to slide quite far. I think its clear that we don’t want Rhino sliding as far as Proxy. In fact, I think the only mercs that should be able to use the slide effectively would be all the glass cannons (Proxy, Sparks, Aimee, Aura). Sliding works for many characters, i.e Fletcher, Phantom (if he needs to get away), Kira etc… but it doesn’t (shouldn’t) work for people like Stoker, Arty, Fragger, Thunder, Rhino, etc… hence why its a pretty controversial topic. The way the wall-jump works is very similar.
If there were to be any sliding in DB, it should really only cover a short distance (max 3-4 meters), and even then only if you have a really quick merc with their knife out. It should also be short in terms of time, like max 1-2 seconds of sliding, and then you’re back up again. A cooldown would be ideal, i.e 5 seconds, and finally, nobody should be able to use their abilities whilst sliding. I think the kind of sliding that the original Mirror’s Edge has would be the most balanced for DB.
If sliding were to ever be implemented into DB, it should be really similar to wall-jumping; (simple, short, easy, present, but not necessary, and only really practical for the glass cannons).