Difficulty indicator for each level

[heart66]

İs it possible to add difficulty indicator for each level instead of naming the pack ?... Easy , hard ...etc.
İt could be a one digit field (1-9) or (1-4). A scale from easy to most difficult.
This can be assigned by the level creator in the editor and shown later in the player.
This can be taken further later by averages or other statistical means by online input from players.
İt will be interesting to know how difficulty curvers can be changed with more samples (players).
Thanks.