i wouldn't go around fucking with your skis like that, especially if you are new to park. the more you hit rails, the more your edges will dull so you will be fine.  if you have to ask our advice on whether to file your edges, you probably need our advice on how to do it too.  so really ask yourself, "how often am i going to be using these in the park" before you do things that are difficult and potentially expensive to fix if you don't like it.