How is this the case? How many 3rd-party mice don't have a scrollwheel? (Especially gaming mice!) The other question is "What is the default behavior?". If I p

How is this the case? How many 3rd-party mice don't have a scrollwheel? (Especially gaming mice!) The other question is "What is the default behavior?". If I plug a mouse without a scrollwheel into my iMac, do scrollbars show up by default? It seems a sensible way for them to handle that case, but we'll see.