Self-explanatory illustration:
https://dl.dropboxusercontent.com/u/4019461/MEP-DeletingKF-1.jpg
Bug, design flaw, or none of the above?
If it is indeed impossible to delete by keystrokes alone, then one unsatisfactory work-around is to disable the option Combine effects curve with object length, shorten the object, click the KF with the mouse, press Delete, and then restore Combine effects curve with object length. Tedious if there are many such operations to perform.
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Also, anyone able to explain the following odd behaviour please?
https://dl.dropboxusercontent.com/u/4019461/MEP-DeletingKF-2.jpg
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Terry, East Grinstead, UK