The slap command is a fun gimmick between players and is really humorous at times,
although some new players (also old players but not as often) take it a tad bit too far by using /slap consecutively, which then sets a chain reaction with other people.
The one slapped, will want to slap back, which will then ensue a back and forth between the parties involved.
And since the slaps are seen throughout the server, other players will use it as well to stir more humor eventually spamming the chat box for everyone online,
including those who don't want to participate in the slapfest of hell and just want to go about their business.
Making it only SM+ will make it another fun addition to the set of perks that Senior Members receive, and most importantly
it will reduce the overuse of /slap by new members and SM+ alike, because then it can only be used by the smaller percentage of the community.
The idea was given to me by one of the senior members who mentioned it ingame, I believe it was EMULATOR. (correct me if Im wrong)