There are a number of improvements that I would like to make to Arachne. Here are the changes I am planning at present.
Allow user to adjust the zoom level at which the image is displayed.
Let the current image to be fixed at the current size as the new original allowing sequences of resizes in different directions.
Make the tool size adjustable.
Add shortcut keys.
Add a built-in crop tool.
Improve performance and responsiveness with large images.
If you have any suggestions for features you would like to see then please let me know.