For the park quiver, using a chrome file, I detune (practically round) my edges from an inch in front of my bindings to an inch behind on both sides. I've had people come into my shop and ask only for the outsides to be detuned so they can still use their inside edge, but this makes little sense to me.
I detune my skis after putting a 1 1/2 degree base bevel on them. I use a 1 1/2 degree instead of a 1 degree or 1/2 degree because it raises the effective edge off the base more to prevent catching an edge on boxes, rails, and even pavement.
I use a 1 1/2 degree side bevel to make them sharper in the rest of the edge that is still effective. This helps still carve when you're riding fast, but with the base bevel raised it isn't catchy. Typically, when people mention a 90 degree bevel, thats 1 degree base, 1 degree side. Pretty standard many factory brands. Not to aggressive, not to wimpy (actually, its pretty weak for ripping around on hard snow).
After they are tuned and detuned, I use a gummy stone to remove any burrs or edge flake, and then I go pretend to shred like I'm 10 years younger and not an old gaper.