It might. I personally wouldn't consider it high priority, but it might be a nice addition at some point. I'll make sure your request gets added to the list of possible future improvements. However, don't underestimate the disaster potential implied by enabling custom file names (you might end up overwriting existing files in case of name collisions, errors in your script, etc.).
While we're on topic, I should probably outline the current automatic file naming scheme for screen captures here:
scriptname_subjectid_date(MMDDYY)_time(HHMMSS)_blocknumber_trialnumber.bmp
resulting in e.g.
DrawingTask_23_112612_130143_3_4.bmp
Hope this helps,
~Dave