Default Searching to "My Records"

Is it possible to default the Target Search Field for one object (specifically Appointments) default to "all records I own"?
In our instance, everybody's appointments and tasks are open and viewable for everyone else. With PIM Sync, there are personal appointments that are being exposed in CRMOD. Teaching users to mark appointments as Private in Outlook is too big of a change to handle, so we are looking at ways to eliminate the possible searching of others' personal appointments.

Thanks in advance.