Consider a larger button or something that could sit over the top of the current button so those with disabilities (fine motor issues) can have increased independence and environmental control. I'm a speech and language therapist supporting students/adults who are non-verbal and have conditions such as cerebral palsy - it would revolutionise their world if they were able to use a mainstream piece of tech to be able to switch their TV to a favourite channel; play favourite music etc (without a complex communication device or dedicated piece of technology which are often unavailable at reasonable prices).