Where your Honorbuddy executable is located, there should be a file named "ProtectedItems.xml."
Any item listed in this file will be protected so that the bot won't sell it.
To add your items, just copy the current formatting of the items that are listed by default.
I don't think it's a good solution cause I need that EACH equipment piece that the character is aquiring during his joruney is protected and I can't add them all.