There's a dialog box of DTS application-wide settings that disappeared from SQL Server 2005 and 2008. It used to live on the context (right-click) menu of the DTS node in SQL Server 2000 Enterprise Manager. One day in a moment of spare time I set about to re-create it for use on a SQL Server 2005 or later computer with DTS support installed. The Visual Basic.NET source code is contained in this file. Here's now my Windows Form (right) compares to the original DTS dialog on the left...not bad, huh? I even gave it an accurate title!
I suspect that the "refresh cache" functionality is not useful, because I assume that the data is cached in memory in the process of my little standalone app, and can't be used by the DTS runtime...but at least you see the DTS API calls.