Shapr3D has various methods to change from making a rectangle from the center, corner, or three-points, it would helpful and faster if changing the various types could be done with modifier keys, like in Adobe Illustrator. In Illustrator for instance, pressing “R” gets the rectangle tool but then pressing “Option” creates a rectangle from center of where you started the rectangle and pressing “Shift” creates a square. In these examples, a keyboard would be used. However, in the apps by Affinity they use an onscreen modifier know as “Command Controller” to access modifier keys normally found on a keyboard. Both are great examples of what could be adopted by Shapr3D.
↑ from Affinity Designer 2
↑ from Adobe Illustrator
I feel this would speed up sketching and it’s a know shortcut for many users.