I can relate as I carry the DX of lower motor neuron disease, still consider myself lucky though as I have made it 8 years without croaking. Neurological conditions vary so I realize it may be different for you but even a synth action is very tiring, not to mention typing. While browsing online retailers I have seen one that does rent but I can't remember who (sorry). Anyhow, if you ever feel like bitching about things, drop me an e-mail. As I said, I can relate.