The Spamcontrol Plugin will warn players who are spamming the chat zone.
<configuration plugin="spamcontrol"> <settings name="settings"> <set name="max_spamins">10</set> <set name="mod_level">20</set> <set name="falloff_rate">6.5</set> </settings> </configuration>
Each time a player talks, the spamcontrol plugin update a 'spamins' score following the rules below :
new spamins = old spamins + message score - ( gap / falloff_rate )
If you feel that people are getting warned/kicked too quickly you can adjust 2 values in the config file :
To get a better understanding of how those settings affect the computation of the spamins score, get a friend which is below mod_level (not immune :p ) to write stuff in-game while you use the !spamins command to track how your friend's score evolves.