Edição do arquivo Default(linux).sublime-keymap
{ “keys”: [“ctrl+d”], “command”: “toggle_comment”, “args”: { “block”: false } },
{ “keys”: [“ctrl+shift+d”], “command”: “toggle_comment”, “args”: { “block”: true } },

Source:http://stackoverflow.com/questions/11598840/keyboard-shortcut-to-comment-lines-in-sublime-text-2