Are you officially registered as disabled (or planning to be)? Admittedly I haven't looked into deeply, but I got the impression that that system is mostly for people who require some form of government services for their disability, which may not cover you if you're not physically disabled and are currently coping with daily work/life. Also, I don't know your visa situation, but I would be concerned that registering as potentially in need of government assistance would be counted against me when renewing or applying for PR.

Other than that, my personal policy is to not disclose unless I need some kind of accommodation (which I generally don't). I think the risks of having it consciously or subconsciously counted against me outweigh the potential benefits of being favored by a quota.