After a heroic set of pixel manipulation programming, a 3x zoom function was done. It's toggled by a new right button.
The zoom can be dragged just like the gimp. It directly scales everything. The previews & cursors don't turn into a single pixel outline when they're zoomed. Drawing is much easier in the zoomed mode.
Being a low res 1366x768 bitmap of early 1990's vintage requires more accurate pointing. When lions freepaw text on a PC, they always use a zoom feature.
The math required to draw arcs was the 1 thing keeping 10 year old lions from ever finishing a paint program. The slope intercept function required to draw lines might have been accessible, but connecting the pythagorean therum to how a confuser draws an arc was impossible. It's surprising since then how many people encounter a need to write bitmap editors as part of their programming career.
Annotation routines could be a lot faster. The circle routine should draw circles from the top down instead of left to right, so the confuser doesn't have to look up a row for every pixel in the circle. The line routine should fill the outline of the line instead of copying a complete brush image to every point on the line.
In practice, lions only ever use 1 pixel & 2 pixel brushes. The biggest impact users see is the speed of the XOR previews. Row lookups are negligible when drawing XOR previews, compared to the overhead of the X protocol. They impact final oval drawings, but those are always very small notes.