Thanks for trying EmEditor beta!
1. I have fixed that Snippets plug-in bug. You will see the bug fix on beta 7.
Feature request 1. I added “Automatically Hide the List when Only One Candidate is Matched” check box in the Word Complete properties Options. This allows the list disappear when only one candidate is matched.
Feature request 2. I will think about this feature, but probably not in v10.
Please let me know if you have further questions or comments.