mortalis

The Pre button toggles the preformatted style on the selected text or the current line (applies <code><pre></code> tag to blocks). 
The Code button toggles the code style on the selected text or the current word (applies <code><code></code> tag to inline elements).
The default shortcuts for the buttons are:
<ul>
<li>Ctrl+Q – Pre</li>
<li>Ctrl+D – Code</li>
</ul>
In the admin Settings submenu it’s possible to change these shortcuts. 
Press a key combination in the text fields with the Ctrl key included and the text will be filled automatically. Or you can type it manually.
Some combinations may conflict with the default editor or browser shortcuts. 
So check them on your instance.
You may use these types of shortcuts:
<ul>
<li><code>Ctrl+B, .., Z (except AXCV)</code></li>
<li><code>Ctrl+0, .., 9</code></li>
<li><code>Ctrl+[symbols] (-=`[];'\/,.)</code></li>
<li><code>Ctrl+F1, .., F12</code></li>
<li><code>Ctrl+Pad0, .., Pad9</code></li>
<li><code>Ctrl+Pad/, Pad*, Pad+, Pad.</code></li>
<li><code>Ctrl+Shift+...</code></li>
<li><code>Ctrl+Alt+...</code></li>
<li><code>Ctrl+Shift+Alt+...</code></li>
</ul>
This plugin GitHub repository: https://github.com/mortalis13/tinymce-code-formatting.

TinyMCE Code Formatting

Nice and clean made plugin. Thank you!

Adds the Pre and Code buttons to the TinyMCE toolbar with customizable shortcuts

Sjeiti

Mattia Trapani

This plugin lets you save your posts, pages, theme and plugin files, widgets, menus, etc. in the most natural way: pressing Ctrl+S (or Cmd+S on Mac).
I’ve coded this plugin because I was tired of pressing Cmd+S and then realize Chrome was trying to save the whole webpage
After coding this up, I’ve found in the plugin directory two plugins that did the same thing, but each one had some flaws that convinced me to publish mine.
This plugin loads a small Javascript file (minified if not WP_DEBUG). The Javascript checks the contents of any admin page for save buttons.
It is also so smart that saves as draft unpublished posts/pages and updates the ones that are already public.
Also adds a little tooltip on the buttons that can be “clicked” with Ctrl+S or Cmd+S.

Save with keyboard

Installed, no setup, just works - Ctrl/S at at last!

Perfect - Just works!

Works like a charm! Can't believe this feature is still not built-in. Thank you

Finally a solution to an annoying issue!

This plugin works as described and is really handy for those of us who want to keep our hands on the keyboard for maximum productivity. Much appreciated.

Still works, WP 6.0.2

Save everything in the most natural way by pressing Ctrl+S (or Cmd+S on Mac).

TinyMCE Code Formatting vs Save with keyboard