I would love to see you guys having a look at Rhino. This Program has a bunch of awesome features witch would fit in affinity designer just perfectly.
For example there are features witch allow the user to array objects along a curve, in a circle or in a rectangle. other handy features are 'connect' witch connects two individual lines by expanding them till they meet up. Fillet, a feature with connects two curves in a circle. they also approach moving a object in a different way, by setting a reference point to move from. This allows the user to move a object in one position by referring two a distance on another object. I don't say you should copy all of the features. I just think some would be really helpful and definitely worth a look. sincerely Marius