You can only expect to be taken seriously for requests like that if you have been diagnosed with a medical condition. By then, you've already experienced significant pain, so the damage has been done.
Ergonomics for developers is difficult. Damage sets in so slowly that you don't really notice it until it's too late.
By the time you've been diagnosed, its possibly already too late.
I bought a Kinesis Advantage2 (and foot pedal) earlier this year and after a few months of using it, I wish I'd got one years ago. I feel much less typing strain.
Ergonomics for developers is difficult. Damage sets in so slowly that you don't really notice it until it's too late.