We’re a bit off topic here but I’d like to know more about that last comment (detailed feedback / bug report filed into our Bugs and Support
tool would be constructive), especially since QuickEdit has been entirely recoded with Mootools for 0.9.6, one can hardly say it’s out of date
Improvements can always be made, the beauty of OS community is, you can improve it by offering more optimized code, or if you can’t by precise bug reports
IMHO, QuickEdit is one of the very appreciated features MODx has and most CMS don’t have (e.g frontend editing). Helped me sell a few websites indeed, and be the competition (Drupal, Joomla offers...).
As for disabling QuickEdit, well like any other plugin you can disable it pretty easily : Resources > Plugin >> QuickEdit and just tick "Plugin Disabled"...