Morton's hurts like hell when it flares.

I've actually ditched the orthodics I used to use to separate the bones in my right foot. I make sure all my shoes are wide across the front of the foot and the neuroma doesn't flare much.

Riding long miles is not bad, as a properly placed cleat and wide shoes (thank you Sidi Megas!) can help to mitigate the pressure put on the nerves.

Pain only returns when I try on shoes too narrow.

YMMV, I'm not a doctor, Get a second opinion, etc.