this can be done already with the Guevara Edition.. but because every site is different, you will have to do this site-by-site:
1) edit settings.ini, and add a new profile:
[Profiles]
reload_profiles_next_restart=0
num=4
1_name=Audio
1_searchURL=audio
2_name=Video
2_searchURL=video
3_name=Apps
3_searchURL=apps
4_name=Games
4_searchURL=games
a. change num=4 to num=5
b. add: 5_name=Books
c. add: 5_searchURL=books
2) Edit the 'SITE.ini' for the SITE you would like to include this new profile.
a. Under "[script]", add "books=*INSERT THE HTTP ADDRESS FOR THAT SITE'S BOOK CATEGORY SEARCH*"
3) Exit & Re-open Bit Che
4) Switch to the new "Books" profile
5) Enable the SITE on the Scripts List
6) Repeat Steps 1 & 2 for each additional 'Profile' type you would like to add to Bit Che, and for each Site you want included in that profile.