You can disable any category of keyboard shortcut:
(Alt + click on any post or PM)
Selects the post or PM.
(Alt + T and Alt + C on any posting page)
Alt + T toggles the posting page between visual and bbcode modes while Alt + C submits the text in the editor.
Quick Reply Submission:
(Alt + C on any page with a quick reply)
Submits the text in the quick reply.
(Alt + R on any page with a reply button)
Navigates to the posting page.
(Alt + D, Alt + W, Alt + Q)
Alt + D takes you to the navigation tree, Alt + W takes you to the live search box, and Alt + Q takes you to the quick reply box.
Please note that Alt is used here as a representation of your browser's Access Key. This is most commonly Alt on PCs and Ctrl on Mac. To find your browser's access key, we recommend checking this page: en.wikipedia.org/wiki/Access_key