Joe,
So I'm thinking that this should be a go to idea for engines that appear to be locked up when testing in conventional mode. Maybe an engine that won't add to a remote for example, should be tested in conventional mode to see if it exhibits this behavior.
I think not. What does being unable to add to a remote have to do with being locked in a direction or in neutral?
If the engine exhibits an issue under DCS regarding being locked in a state, then the engine should be tested in conventional mode.
There are several reasons and solutions that are specific to an engine being unable to be added to a DCS Remote. All of those should be attempted first to remedy that specific problem.
While George's explanation is concise and completely valid, note that the first thing he said was:
"For a problem engine I always start off trouble shooting in conventional..."
It appears that George does a conventional reset as a matter of course for every repair. However, nowhere in his explanation does he indicate that the reset cures an engine that won't add to a remote. Rather, he's primarily discussing directional issues.