Ok, gracias, supongo que te refieres a esta parte:
Gallery Issues
Thumbnails and some database's could get corrupted making the media scanner running berserk, resulting in battery drain.
Delete the following:
dbdata/databases/com.android.providers.media
dbdata/databases/com.cooliris.media
And clear the thumbnails folders on sd cards.
I have created a CWM script to do this for you -
Gallery Cleaner
De todos modos yo sigo teniendo la misma duda, si eliminamos los thumbs, cuando abrimos la galeria no vuelve a generarlos???