I'm afraid at the moment we don't support programmatic modification of the script list. We'll bear this in mind when we're looking at future versions, though - so thanks for the suggestion!
Just to clarify, do you need something that lets you modify the list "on the fly" (i.e. execute one script, modify the list, execute the next, modify the list etc.), or do you just want to be able to create a list of scripts programmatically, then run them all in one go?