Instead of "From 9 to 5 from Mon to Fri", be able to say "From 9 to 5 from Mon to Fri, except on Dec 25, Jan 1, etc". This allows to take plan for holidays, teammate PTOs, company events, etc.
The ability to tag drafts would be useful so that the user is allowed to "sit" on an email for a while, and not forget to tag it after sending. Currently, the only way to apply a tag to a draft is to schedule it for sending later, and then cancel ...
Ability to reorder articles manually in the knowledge base
Today, the order in which articles appear in a KB depends on when they were last modified. Users are unable to manually update the ordering. This feature would allow users to change the order in which articles show up.