There's an open feature request against sphinx-click, asking that we stop ignoring truncation of help strings when generating the documentation. Unfortunately, a quick look suggests this is not currently possible because we don't store the help string before we truncate it.

This RFE ask that we provide some mechanism to access the raw help string. I suspect this will involve either (a) storing the "raw" help string in a different attribute or (b) storing this in the help attribute and truncating on load rather than on store.