You already have the facility to create an operation that limits the players who can join it by their current rating. This would also limit the "nickhiders" so many of you complain about!
The current smallest range is +/- 50 points from your own level, with no maximum ranges.
Why not simply use the tools already provided to you to limit who can play in the operations you set up.
"1 player, who locked his operation with a password and gave it to his friends only, then asked friends don't to shoot him, while he will kill them to get points without ANY counterplay."
If a moderator sees this then all the people in the room are likely to be banned, and their points reset