It would be nice to see the sticky follow fixed.

You can disable the You are now my Master messages by opening WoW\Interface\Addons\twoboxtoolkit\twoboxtoolkit.l ua in a text editor, searching for lines containing You are now my Master and commenting them out with -- (two hyphens).

SendChatMessage("You are now my master", "WHISPER", nil, self.db.profile.master);
becomes
--SendChatMessage("You are now my master", "WHISPER", nil, self.db.profile.master);

EDIT:

OK played with the Code a bit and I may have sorted the other 2 issues I had with it, I wanted to disable sticky follow on the master and relay messages on the master. Seems to be working but YMMV.

Code:
Search the file for
function twoboxtoolkit:GetMaster()

Then add a function below it so it now reads
function twoboxtoolkit:GetMaster()
return self.db.profile.master
end

function twoboxtoolkit:IsMaster()
return (string.lower(UnitName("Player")) == twoboxtoolkit:GetMaster())
end

Change
function twoboxtoolkit:PLAYER_REGEN_ENABLED()
if (self.db.profile.sticky and lastFollow ~= nil and isBroken) then
    FollowUnit(lastFollow);
    isBroken = false
end
end

To
function twoboxtoolkit:PLAYER_REGEN_ENABLED()
if (self.db.profile.sticky and lastFollow ~= nil and isBroken and not twoboxtoolkit:IsMaster()) then
    FollowUnit(lastFollow);
    isBroken = false
end
end

Change the function twoboxtoolkit:relayMessage(msg)so that it starts
function twoboxtoolkit:relayMessage(msg)
	if (twoboxtoolkit:IsMaster()) then
		return
	end
	if (self.db.profile.relaychannel == nil or string.len(self.db.profile.relaychannel) == 0) then