There's no way to programmatically control S&T, a program written for MapPoint will not work with S&T.
Also, you cannot really integrate the S&T program with a custom application, not like you can with MapPoint.
No matter how you ask the question the answer will not change, sorry!
About the best you can do is use WinBatch or the SendKeys function to automate S&T, I have done some simple VB programs that control DeLorme StreetAtlas using WinBatch, presumably you could do a similar thing with S&T. It's kludgy but it can work.
Eric