Using a plugin is far faster and easier than editing the wp-config file; plus everyone can Activate or Deactive them whenever is needed.
I’ve got very limited time to test them, but I’m actually using the “disable-revisions-and-autosave” on this blog and as far as I can say it works flawlessly.
Every comment or hint is very welcome!
The disabling Autosave plugin was already online yesterday, but I’ve slightly modify it to report the original code author.
WordPress插件：Disable Revisions and Autosave下载地址：
http://exper.3drecursions.com/wp/disable-revisions-and-autosave.zip
Disable Revisions and Autosave官方地址：
http://exper.3drecursions.com/2008/07/25/disable-revisions-and-autosave-plugin/