Completed items in Inbox don't go away
 

Occasionally, I'll complete an action and mark it as such while it is in the Inbox, before I get a chance to properly categorize it. However, the item remains even though it is marked as completed. I either have to delete each item or assign it to a Context and Project for it to disappear.

Bug, feature? Is there a workaround?

Do you also use the Mac version? If so, open the preferences (on the Mac) and make sure you have "Clean Up completed inbox items" checked.