GlueFactoryBJJ

My co-workers have (loudly) noted an annoyance in the gradient tool. It always defaults to fill.
When you happen to put a gradient on a large number of strokes, it is exceptionally annoying and disruptive to have to go up to the toolbar and select stroke each time we activate the tool.
It must be quite simple to implement that last selected mode is remembered the program session out.
I just remembered this when I read this related entry from another customer, so it is a problem (and it IS a problem that needs to be solved in multiple places in all applications):
 

There’s a ‘Use Fill’ checkbox on the Context toolbar.
Affinity Designer Help: Pen Tool

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That did it, but I don't understand the purpose of having that option?

I was about to suggest the Perspective tool, also. However, I always use it as a Live Filter. Also, I find that setting it in Destination mode lets you get a real-time update of how the output will look. I often turn off the grid mode and align the verticals visually.

NOTE - In the video you linked, the user put vertical guides on the image in order to more precisely align the elements in his photo. You can do this in Affinity Photo, too, by using the Move tool to drag one or more Guides onto the image. The, using the Perspective Filter, you can align the image elements with the vertical guides you just placed.