Default [Q] S-Finder - add new categories for indexing ?

hello world (cit.)

in s-finder (on my n9005 running 4.4.2 stock rooted) i'd like to manage the categories to search within, in particular i'd like to add more than the default, like whatsapp and gmail: is this possible, maybe through xposed modules? Google didn't help me

these are actually the categories available: