I* think a sensory trait would be doable. For auditory sensitivity, the sim could get tense in loud, busy environments and need to withdraw for a while. They already have a similar mechanism in the loner trait. The spa music channel could grant calming effects. Tactile, smell and visual sensitivity could trigger an uncomfortable reaction similar to the squemish trait when other sims try to hug, when something smells bad, when there’s too much activity, or when wearing certain clothing. A weighted blanket, lava lights, fidget toys and lotion could grant a calming response along with the tea maker. If they ever allow us to select food likes/dislikes, that could be used to define taste/texture sensitivity.
*(SLP who worked for years in a sensory integration program for toddlers)