Show/hide in game/machine lists, that is... the search ignores that. Again, there will be a reg-exp filtered view where you can filter out whatever you want.

The main reason why the search result ignores this is that there are devices which require ROMs, and you wouldn't even be able to *find* them otherwise (when devices are completely invisible).

A mind is like a parachute. It doesn't work unless it's open. [Frank Zappa]