You can turn the editor on and off, but replacing it would be a very significant programming task. There are only a few "through the browser" editors around and none that I have come accross support a drawing pad. The main medium of the web is HTML so allowing the direct editing of drawings would raise interesting issues of file saving/embedding. By the way, you are probably best off not using the word Urgent in posts unless you are in a life threatening situation.
Text editors
Can I change the HTML Editor in Moodle? (Urgent)
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