Just write a simple autoit script.
Code:
While 1
Send("Put Text Here")
Sleep(5000)
Wend
That will send the message every 5 seconds...and for 2 messages simply change it so it's like
Code:
While 1
Send("Put 1st Message Here")
Sleep(5000)
Send("Put 2nd Message Here")
Sleep(5000)
Wend
Better to write it yourself than use something 3rd party imo.