Th easiest way would be to have all your games in their own folders (which you should be doing anyways). Name each games folder the name of the game and when you import choose to import with folder name, that should allow LB to scrape them properly.
The one issue with this though is you really should name the folders with more details such as patch version and which audio tracks because there are several versions for many of the games and if you don't name them properly you can easily forget what version you have.
Personally I just import the roms and then go into LB after and fix each game up, renaming them in LB and letting the scraper do its thing after. Yeah it's more time consuming but there aren't that many MSU games and there are even fewer good ones worth adding to the collection.