at the shower, peeling paint and actual drywall repair are 2 different things so unless there are actual repairs, i would just remove loose paint, prime, recaulk and paint.... and clarifying the door work, although the soft spackle will somewhat harden when the new paint absorbs into the patch, I would look at using a 2 component bondo on the large flat area and the spackle on the trim if it is ornate with routed grooves and radius's with as it is a bit easier to sand down to match the existing trim...good luck