The FP sticky lists orders of priority for FP picking. If nothing above a show (Indy in OPs case) works for you, for one reason or another, might as well pick the FP for a show.
Even if there is only a small benefit, it will almost never be a detriment. The exception might be Disney Jr show, where the FP holders are let in first, and directed to sit front and center. Problem is, the stage is elevated, and little ones have trouble seeing from right in front of the stage.