I'd like to add my vote to this. I recently bought an iPad for the first time just to try out Affinity, since there's a bit of a buzz about it. Overall it's very impressive, but straightening images is far more of a pain than it should be. In Photoshop Camera Raw I just draw a line with the straighten tool and it automatically aligns the crop edges to the interior corners of the image, so that all the transparent triangles produced by the rotation are trimmed away leaving me with the maximum amount of image that will fit.
In Affinity this simple process is a lot more difficult. Since navigating around the crop with two fingers is a bit unreliable (often resulting in accidental panning or rotation of the crop) I end up having to straighten with the crop tool, then add 2 horizontal and 2 vertical guides which I can position precisely at the interior corners while zoomed in, then running the crop tool again with snap to guides on.
I know you're a small team, but this is the sort of workflow improvement that might not look impressive on a feature sheet, but makes a real difference in day-to-day use of the app. I'd really like to see it get a higher priority on your roadmap, since straightening images is such a common requirement.
