Pattern matching, especially when working with the reflection API, is harder than necessary, because the IDE gives no useful indication of the to-be-deconstructed (number of parameters, types, names, etc.) item.

Given the following example class ...

case class Car(brand: String, model: String, make: Int)

... consider this example ("|" is the position of the cursor):

def buyingDecision(car: Car) = car match {
  case Car(|
}

Currently, no completion or suggestion is offered.
What I would like to see would be a completion using the parameter names from the definition of the class/extractor/... as a variable name:

case class Car(brand: String, model: String, make: Int)
def buyingDecision(car: Car) = car match {
  case Car(brand, model, make) => |
}

I'm not familiar with the IDE internals so if people think this would be trivial to implement, I would give it a shot myself.