Add customization for To-Do notifications

We have set up a workflow, that is fairly complex and has a lot of approval To-Do's.
Every time, someone else pushes an idea forward, I get one email for each of the To-Do's I have been assigned. This generally are 4-8 for most steps.

Getting that many emails (max so far has been 14 at once), is very annoying, especially when multiple ideas are coming in per day.
There should at LEAST be an option to have To-Do's send out summarized, given that they all originate form the same idea. (ideally just like the other 2, so one could get a daily digest of To-Do's)