Task begin date
Many tasks cannot be started until a later date. A task can have a due date, as well as a begin date. For example I may have a task such as "Check if money is deposited". I cannot actively work on this task, instead it has no due date. It only has a reminder or begin date since I have no control over when the money is deposited, yet I want to check up on it.
Another example is if I have both a begin date and a due date. Let's say I am only willing to work on a given assignment beginning Monday because it won't be ready until then. Sure I would like to start on it Sunday but I can't, so I should be able to mark it as start-able on Monday, that way when I scan my todo list it doesn't show up until it is ready to be worked on.
Yes! This feature is available in other apps I've used and I sorely miss it in Todoist.