l - Limit
Limits the number of users that can be in the room simultaneously. The limit can be set to something lower than the current user count, it only prevents new users from entering when the room is full or overfull.
Privilege: Channel Operator
Examples:
/mode #webchat +l 50
L - Language filtering:
When language filtering is enabled on the server one option is to give each channel the choice to enable this or not. Will prevent words on the filter list from reaching the room either by the filter or censor rule as set by the administrative policy of the server.
Privilege: Channel Operator
Examples:
/mode #webchat +L