You shouldn't need to build your file list with a script task.  The foreach loop container allows you to loop through files in a specific folder.  Select "Collection" in the foreach...

Hello,

Sounds like what you need is to create an asynchronous transformation.

http://msdn2.microsoft.com/en-us/library/ms136133.aspx

Donald Farmer's Rational Guide to SSIS is also a good reference.

Hope this helps.