Just move any large files from in the game folders to a place in MyDocs and create a symlink using FileBox to where each file is. Note don't move files like the save files and the one's that actually execute the game. like Asphaly5 for Asphalt5 and little files can stay in opt or where ever you got your ganes files like videos for games can be either moved or deleted. I don't see them as important so I delete them. Sound folders take up a lot of space so I would move those and level packs as well.

Then when you're done enable extra devel and get tracker-cgf

then add the folder where you put all these folders from opt to MyDocs in the "NoWatchList" and run this command in X Term: tracker-processess -r and wait till you media player database is recreated.