Workers with RSI will get a doctor to prescribe a proper ergonomic workstation / peripherals. In fact, it's almost impossible to see a doctor for RSI without getting that. Afterwards, the employer will be forced to comply with that prescription. Even if they don't legally have to comply (in many places they do), the threat of a lawsuit should take care of that. This also solves the jealousy problem of other coworkers wanting gadgets because their disabled colleague is getting the equipment he desperately needs to work as they would need to be prescribed by a doctor or other health professional.