Sure, that's the "mop-up" setting.
If you are OK with that pitcher being used when you are ahead by a lot (not just when you're behind by a lot), then be sure to uncheck the "use mop-up only when losing" box on your style settings in the manager center.
Be aware though that using the mop-up can have unintended consequences, and occasionally other users feel that the mop-up is not used properly.
For example, if you really want someone to mop up, you probably want to set their pull setting to "1." No sense using them if they're going to be pulled after giving up a couple of hits. The problem with that, though, especially if you use the mop-up guy with a lead, is that he may be left in to absorb a beating and blow the lead.