The format for groups is:

Code:
#GROUP ON/OFF
code, events, etc.

#GROUP END

You can then use:
Code:
.enable #GROUP
.disable #GROUP

To enable or disable the group.

To do that for your code:
Code:
#limite off
on join:#: {
 .mode # +l $calc(%limite +1)
}
#limite end

Then you can use /enable #limite, and /disable #limite to toggle it.