diff --git a/earwigbot/config/permissions.py b/earwigbot/config/permissions.py
index b05f215..6375cf3 100644
--- a/earwigbot/config/permissions.py
+++ b/earwigbot/config/permissions.py
@@ -27,6 +27,12 @@ from threading import Lock
 __all__ = ["PermissionsDB"]
 
 class PermissionsDB(object):
+    """
+    **EarwigBot: Permissions Database Manager**
+
+    Controls the :file:`permissions.db` file, which stores the bot's owners and
+    admins for the purposes of using certain dangerous IRC commands.
+    """
     ADMIN = 1
     OWNER = 2
 
@@ -68,6 +74,22 @@ class PermissionsDB(object):
         query = "INSERT INTO users VALUES (?, ?, ?, ?)"
         with sqlite.connect(self._dbfile) as conn, self._db_access_lock:
             conn.execute(query, (user.nick, user.ident, user.host, rank))
+        return user
+
+    def _del_rank(self, user, rank):
+        """Remove a User from the database."""
+        query = """DELETE FROM users WHERE user_nick = ? AND user_ident = ? AND
+                                           user_host = ? AND user_rank = ?"""
+        try:
+            for rule in self._data[rank]:
+                if user in rule:
+                    with self._db_access_lock:
+                        with sqlite.connect(self._dbfile) as conn:
+                            args = (user.nick, user.ident, user.host, rank)
+                            conn.execute(query, args)
+                    return rule
+        except KeyError:
+            return None
 
     def load(self):
         """Load permissions from an existing database, or create a new one."""
@@ -94,13 +116,21 @@ class PermissionsDB(object):
         return self._is_rank(user, rank=self.OWNER)
 
     def add_admin(self, nick="*", ident="*", host="*"):
-        """Add an nick/ident/host combo to the bot admins list."""
+        """Add a nick/ident/host combo to the bot admins list."""
         return self._set_rank(_User(nick, ident, host), rank=self.ADMIN)
 
     def add_owner(self, nick="*", ident="*", host="*"):
         """Add a nick/ident/host combo to the bot owners list."""
         return self._set_rank(_User(nick, ident, host), rank=self.OWNER)
 
+    def remove_admin(self, nick="*", ident="*", host="*"):
+        """Remove a nick/ident/host combo to the bot admins list."""
+        return self._del_rank(_User(nick, ident, host), rank=self.ADMIN)
+
+    def remove_owner(self, nick="*", ident="*", host="*"):
+        """Remove a nick/ident/host combo to the bot owners list."""
+        return self._del_rank(_User(nick, ident, host), rank=self.OWNER)
+
 class _User(object):
     """A class that represents an IRC user for the purpose of testing rules."""
     def __init__(self, nick, ident, host):
diff --git a/earwigbot/irc/connection.py b/earwigbot/irc/connection.py
index da38e3f..c6cb1c6 100644
--- a/earwigbot/irc/connection.py
+++ b/earwigbot/irc/connection.py
@@ -43,6 +43,7 @@ class IRCConnection(object):
         self._send_lock = Lock()
 
         self._last_recv = time()
+        self._last_send = 0
         self._last_ping = 0
 
     def __repr__(self):
@@ -87,6 +88,9 @@ class IRCConnection(object):
     def _send(self, msg, hidelog=False):
         """Send data to the server."""
         with self._send_lock:
+            time_since_last = time() - self._last_send
+            if time_since_last < 0.75:
+                time.sleep(0.75 - time_since_last)
             try:
                 self._sock.sendall(msg + "\r\n")
             except socket.error:
@@ -94,6 +98,7 @@ class IRCConnection(object):
             else:
                 if not hidelog:
                     self.logger.debug(msg)
+                self._last_send = time()
 
     def _split(self, msgs, maxlen, maxsplits=3):
         """Split a large message into multiple messages smaller than maxlen."""
@@ -158,7 +163,7 @@ class IRCConnection(object):
 
     def say(self, target, msg, hidelog=False):
         """Send a private message to a target on the server."""
-        for msg in self._split(msg, 500 - len(target)):
+        for msg in self._split(msg, 400):
             msg = "PRIVMSG {0} :{1}".format(target, msg)
             self._send(msg, hidelog)
 
@@ -177,7 +182,7 @@ class IRCConnection(object):
 
     def notice(self, target, msg, hidelog=False):
         """Send a notice to a target on the server."""
-        for msg in self._split(msg, 500 - len(target)):
+        for msg in self._split(msg, 400):
             msg = "NOTICE {0} :{1}".format(target, msg)
             self._send(msg, hidelog)
 
diff --git a/earwigbot/wiki/copyvios/exclusions.py b/earwigbot/wiki/copyvios/exclusions.py
index 23c1daf..3600f97 100644
--- a/earwigbot/wiki/copyvios/exclusions.py
+++ b/earwigbot/wiki/copyvios/exclusions.py
@@ -44,7 +44,7 @@ class ExclusionsDB(object):
     """
     **EarwigBot: Wiki Toolset: Exclusions Database Manager**
 
-    Controls the :file:`.exclusions.db` file, which stores URLs excluded from
+    Controls the :file:`exclusions.db` file, which stores URLs excluded from
     copyright violation checks on account of being known mirrors, for example.
     """