TiVo's website is supporting Wishlist features not available, yet. It lists multiple text entries that you can include, exclude and make optional. Looks like a version 9 software update is coming.
http://customersupport.tivo.com/LaunchContent.aspx?CID=7E7238A7-E649-40D4-8255-0A783A80C29B
"Example:
Keyword: (CHOCOLATE) * (VANILLA) * -STRAWBERRY
Category: INTERESTS: COOKING
This search will find only cooking programs with chocolate and/or vanilla in the guide data, but will ignore any programs with strawberry in the listing.
Example:
Actor: ANISTON, JENNIFER
Title Keyword: -FRIENDS
This search will find all programs with Jennifer Aniston except for the program 'Friends'. "
http://customersupport.tivo.com/LaunchContent.aspx?CID=7E7238A7-E649-40D4-8255-0A783A80C29B
"Example:
Keyword: (CHOCOLATE) * (VANILLA) * -STRAWBERRY
Category: INTERESTS: COOKING
This search will find only cooking programs with chocolate and/or vanilla in the guide data, but will ignore any programs with strawberry in the listing.
Example:
Actor: ANISTON, JENNIFER
Title Keyword: -FRIENDS
This search will find all programs with Jennifer Aniston except for the program 'Friends'. "