Spadille doesn't really focus much on server admin controls.

As for the concept, it's technically possible for something like that to be implemented server-side. I wouldn't suggest it though. Pings are constantly changing due to a wide variety of factors and could easily prove to cause more harm than good. Regardless, a user could join your server with a ping that meets your desired "standards" and then afterwards have a high peak in latency, it'd kind of defeat the purpose of your initial blockade. If a user's ping becomes unbearable, chances are they'll quit due to frustration on their own.

Is there any way to block people with a ping higher than X to join my server? It gets annoying when one person is ruining it for all peoples.