Seek & Search function: Seeking on multiple classes possible?

[SuzakuCMX]

???
.............. there just aren't enough words to describe........

For #1: Why would Billy just randomly party? Most people stick to one or two classes.
#2: DoH/DoL don't get anything out of being in a party, so why are DoH/DoL classes available to pick as a preferred class when putting yourself up for a party?
#3: I want us to be able to check multiple classes and for the "None" as a preferred class to function as "Any"