When using the "no auto remove" style speech skipping, it looks odd that the characters keep moving their mouths when all they have said is "No."
I suggest the animation lasts as long as it would in the other speech skip modes, and then the character returns to the idle frame.
I realise this can be hacked by turning on lip-syncing...
Cheers,
Steve
[EDIT] Thanks Chris!
This is already implemented for Sierra-style speech; I'll add it to my list to get it done for lucasarts-style speech as well.