i don't know how to arrange the library by file name...but what you can do is change the 'sort order' title to something like Batman 1 - Nolan & Batman 2 - Nolan.
Then you can arrange the library by sort order and they movies will show up together. This also gives you the added bonus (if you use xbmc that is) that whenyou update the library in xbmc, the movies will be sorted according to the sort order, and not the title.