I don't like seeing tasks I can't immediately get on with, so I only create a task when I've done all the prerequisite ones. That makes adding a string of sequential tasks a bit of a problem. My solution:

• create a single RTM task for a whole string of jobs. The name of this task is the first job in the string. The due date, tags and priority are those for the overall project.
• add to the task a note called "and then...". Each line of this note is a follow-up task.
• when I complete the first task, before I click "complete", I click "duplicate". this creates a new task with the same deadline, tags, list, notes, priority and so on, into which I can quickly paste the next job title from the note. Then I click "complete" on the original task so that's filed away as a completed task (and because it's satisfying to do so). Delete the completed task from the note if and when you can be bothered.

I also use a special tag to visibly highlight tasks with "and then..." lists, just so I don't absent-mindedly click "complete".

If you have 'milestones' within the project with their own due dates you can either add those to the note, and update the due date every time you hit one, or make separate task-lists leading up to each one. Depends if you favour a hassle-free system where you can always see the deadlines, or a cleaner but slightly more awkward one.

One problem is that there's no "duplicate" button on the iPhone app.