If I preassign someone for a particular job, is there a chance they will be auto-scheduled for that job outside of the preassignment time if I do not check the box to only schedule them as preassigned?

I have volunteers who want to be preassigned as Job 1 for a particular month. But they volunteer for other jobs that use the auto-scheduler. I didn't want to set them to only be preassigned because then they wouldn't ever be scheduled for the other jobs.

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If you do not check the "Manual and preassigned scheduling only" box, then there is a chance the program auto-schedules volunteers for other positions outside of their preassignments.

In your example if you want them to only be preassigned for Job 1 but then available to the auto-scheduler just for other jobs, what you can do is set them as a substitute in Job 1. The preassignment will schedule them as Job 1 anyways, but because they are a sub the auto-scheduler will never place them in that job, while they will still be open for the auto-scheduler to use them in other roles.