Ok here it is, this plugin will align your drawing on the canvas OR to your selection. Let me know of any bugs, comments ... etc.
performance tweak. barkbark00, I think you should see the performance issue gone, but let me know.
v1.5 - the download link should give you the new dll. the source is not latest, will add that later.
Added horizontal, vertical and both options.
New user interface. Default option is Middle