This is about the lookup dialog windows (Contacts, opportunity, etc), specifically the bottom left quadrant, where you can select from:

Replace Lookup

Narrow Lookup

Add to Lookup

 

Could you please add:

Exclude from Lookup

 

"Replace" is a brand new search

 "Narrow" is a boolean AND

"Add to" is a boolean OR

 

"Exclude from" would add a boolean NOT.   

 

Thanks!