Can you please elaborate?
Yes, it is possible for InDesign to automatically search a specified folder and select a data source (.csv) for data merge based on some guidelines.
Sorry, Aero, but you really -- quite literally -- asked for that!
The point is, with scripting one cannot do some things at all (make 'em run very fast, for example), some things are nigh on impossible and not remotely worth the time (writing a script to properly import a native Excel spreadsheet image, for example), where other things are both possible and quite doable.
Mind you, if you want a complete custom-built solution, you may want to offer some money. There are scripters around that make money writing such stuff, totally tailored to suit. If so, just say the word, and add something like "Contact me through P.M. to discuss pricing", and wait for the best offer.