[Antyrael]

Thanks for pointing me in the right direction, I figured it out!

For those who are interested, here's what I did:

In vbulletin_textedit.js

- Added the line

case 'q': cmd = 'itemlink'; break;

Right after this:

case 'b': cmd = 'bold'; break;
case 'i': cmd = 'italic'; break;
case 'u': cmd = 'underline'; break;

- Added the following code

case 'itemlink':
{
  this.wrap_tags('item', false);
  return;
}

Right after this:

case 'bold':
case 'italic':
case 'underline':
{
  this.wrap_tags(cmd.substr(0, 1), false);
  return;
}

That's all there is to it, when I press CTRL-q it works as intended, pretty simple after all
Only had to find a non-functioning CTRL- key combination, as most are shortcuts for the browser.