get_message() gives generic message with customErrors set to On or RemoteOnly

 Here are the two cases:
1. With customError set to On or RemoteOnly:
When the webservice method throws an error with a detailed error message, then on the error return to javascript, results.get_message() shows the generic message "There was an error processing the request", not the detailed error message.

2. With customError set to Off:
When the webservice method throws an error with a detailed error message, then on the error return to javascript, results.get_message()shows the detailed error message.

I want the customError to be set to RemoteOnly, but I also want get_message() to have the detailed error message, not the generic one.

Any thoughts, fixes, workarounds would be greatly appreciated.
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