I often create and save a task like this:

1 create new task

2 go to 'description'

3 paste something from my clipboard

4 click back to task title with mouse

5 type task title

6 save task

The reason I populate description before title, is that I often want to get something out of my clipboard ASAP.

It would therefore be useful for me to get back to task title (step 4) with a keyboard shortcut, rather than mouse.

Typically, the keyboard shortcut to go back to previous field is shift + tab.

So I think that would work well here.