Actually, what happened was i replied to the wrong post. Meant the one below by Karo >.>

Granted just the ability to go -#tag would be good enough for me honestly. As for complex, it isn't really THAT hard unless your adding in like 12 or 13 tags. Boolean is just math with words.

Say your looking for a picture involving dogs and cats in an amusement park or waterpark. That search would be "(#Cats && #Dogs) && (#WaterPark || #Amusement_Park)". && meaning 'and' so the pic would require both tags to be present , while || means 'or' meaning it only has to have one of them. The parenthesis make it so you keep track of which equation is which and doesn't get mixed up.

Now let's say you want to avoid a certain tag, you could add at the end "!#Birds" to exclude birds. or "!(#Toucans && #Parrots)" to avoid certain types of birds, and "!(#Birds || #Avians || #FeatheredFriends)" to just block multiple words meaning bird.

So the final search would look like this: (#Cats && #Dogs) && (#WaterPark || #Amusement_Park) && !(#Birds || #Avians || #FeatheredFriends)

Normal search engines treat everything as "And" so this just allows you fine tune your searching better if you need something specific for an art reference or some pic you saw 2 days ago that you remember vague details about. It is possible to make it so regular searching is possible without the use of boolean too so this would be totally optional for people.

To sum it up, the ability to exclude certain terms, which can only be done by editing settings in your profile