It would be nice to have the keyboard shortcuts act on the current task (where the arrow is pointing) if no tasks are selected. I've been trying to do as much as possible with the keyboard in RTM, and I find myself having to hit "i" before almost every action to select the current task (to complete a task, change tags, rename, etc.). It would be more intuitive to be able to use "j" and "k" to point to the task you just completed, then simply hit "c" to mark it completed instead of "i, c".

The current functionality could still be there if tasks are selected, but it seems like the best user experience would be to act on the current item if none are selected.