There are two ways to resize in ArtRage 2.0 full version.
From the 'Edit' menu:
Rescale the Painting - Allows you to change the size of the canvas, and the work will be re-scaled to fit into the new canvas.
Resize the Canvas - You can change the size of the canvas, but the paint stays the same. You can position the existing paint on the new canvas. So if you make it bigger, you have more room around your paint, or if you make the canvas smaller, your paint will be 'cropped' to fit.
AndyRage's mantra for graphics engine code:
"Sure - how hard can it be?"