XPOST: Default signing key?

How do you set a default key so that when you attempt to sign, you don’t get
prompted to select a key each time? Also, is there a way to disable the CDO prompt?

Normaly in one of the two Keymanager (GPA or WinPT).
GPA and Sylpeed respect this setting. I just found out that WinPT and the Outlook Plugin (GPGol) don’t use this setting when it comes to signing.
So thats a case for the Bug-Tracker.

What did “CDO” mean?