The interesting thing is that this feature is already there in Captivate! Even more interesting is the fact that it is so simple to use. All you need to do is insert the appropriate tags into the slide notes. You can type in (or copy paste) the tags just like you do any other text.
Just before making this post, I quickly tried few of them:
1. Hello I am here <vtml_pause time=”1000″/> for a break: Introduces a pause of 1 sec in between.
2. <vtml_speed value=”50″> This is my text </vtml_speed>: Helps you control the speed of the text
There are many more similar useful tags. The VTML tags are listed in Appendix C of the document here. It has examples as well on the usage.