It would be very useful to be able to execute/fireoff tasks after a form submission. We can set quite useful rules on form submissions, and can set daily times for tasks to run and keep things in order by running checks, updates etc.. but so much can change within the set time a task is going to run and when a form is submitted.
The "run now" option is great.. and was much needed.. but is not as useful in some situations. Continually going back to run a task can get quite inconvenient.
Running a task with a rule execution after form submission would be awesome!