Inbox : is enhancing search possible ?

Hi everyone,

I am trying to add linking works to my inbox search tool.

1- Instead of having only "is" for "main category", I would like to add "contains"

2- Instead of having only one main category on which the search is done, I would like to add other type of categories (complaints, contracts etc...) : all in one search

Are these two enhancements possible ?

Many thanks,

Eli