Even if you're not interested in the idea of birthing in the tub, have you considered using the water for comfort in labor? The tubs are sometimes referred to as the "midwife's epidural" for the wonderful help the warmth & buoyancy provide. Your hospital may not allow waterbirths, but many have large tubs for laboring. If a tub is not available consider the warmth of the shower as another option.
Your partner can sit on the edge of the tub and provide counter pressure to your lower back, or can bring swim trunks and join you in the tub. Doulas, if a tub or shower isn't available to your client then water can still be used for comfort - try cold wash cloths on her neck and forehead during transition for great relief.