You should be able to do sensitivity on the client side, and not within OIS. Just apply a scaling factor to the values?
OIS still has some work left, and is not considered complete. Yes, dev is slow.. For one reason that I no longer have time to dedicate many hours too, plus I just had my second kid

Patches are welcome, and generally applied when I have time. I would welcome other direct contributors to the projects that might be able to help apply patches, test functionality, etc. Having all platforms available is not a requirement, I have a Mac here nowadays (as well as Windows, and a VM Linux box).