Ah, I'm with you. I got confused coz we're kind of off-topic with this. 
Yeah, finding a character when entering a cast-member is just a straight name lookup, not a search. I think making it a search would complicate the interface a bit too much.
I see where you're coming from with surname vs given name coming first though. We've had many suggestions here on the forums about that, but most involve splitting the 'name' field into two parts, which I don't wanna do coz I like the simplicity of a single field.
Something I do periodically is browse through my creators and check for names that aren't in "Surname, Given Names" format, and fix 'em up. Might be worth doing the same, particularly if you've just downloaded the crew of an issue and it has added new creators to your collection.
In the meantime, I still want to make a link to the online submission guidelines from within Comicster so people know that we prefer "Surname, Given Names" as the creator name format. (I still need to finish that document.)