Dropdown Menus to Autocomplete Inline Fields

One feature that I LOVE about the Tasks plugin is that when you begin typing a task, a menu pops up with options to autocomplete the key values for the task.

It would be awesome if there was a plugin where you could initialize these types of dropdown menus for inline fields.

MetaData Menu is close, but it would be a gamechanger if the dropdowns appeared inline as you’re typiong.