Hi Affinity,
Affinity Photo has so much going for it. One feature I'd really like to see added though is a freely spin-able working area, or "rotate artboard" functionality. This would be where the user can click a keyboard shortcut to the spin feature, then freely and organically spin the working canvas to any angle desired just by dragging the cursor. Photoshop has this and it's a huge benefit, especially for those trying to draw with a stylus pen. It's like being able to rotate a sheet of paper to any angle while drawing on it. I know that others have made comments on this too. I hope it'll be a priority for Affinity to add it soon. The 15-degree increments that are currently available are at least something. But they don't measure up to a fluid, full-range canvas-spin feature.
Thanks for checking my suggestion!