Nope, not how it works. When you check the "use starter in relief" box, then sparky treats that starter like a long reliever. If you don't want him used that way, don't check the box. No real life manager uses LH/RH specialists in the 5th inning (or if any do, it's an extremely rare occurrence historically). The vast majority of managers who have been in the majors use a long reliever in the 5th inning.