I'm quite heavily -1 on this.

This is removing various entries that I personally use regularly and that I think users rely on:

• Add Widgets
• Add Panel
• The lock toggle

These are only "unnecessary" if you assume people actually understand and use the desktop toolbox, which I don't believe (plus we allow disabling it, which means these actions become wholly inacessible). I'd wager vastly more people use these via the context menu.

It also removes an action that's part of the Plasma design, the associated app action that a containment/applet can change dynamically, and that's quite useful together with Folder View.

I agree, the context menu looks really convoluted. But what happens when the cashew is disabled and the desktop is empty? There would be no way to add widgets.

Why not just create a new submenu called "Manage" or something instead for:

• Add Widgets
• Add Panel
• The lock toggle

and maybe even put "Configure Desktop" in there.

This would already improve the current menu a lot:

• Manage...
  • Add Widget
  • Add Panel
  • Lock
  • Configure Desktop

-1, sorry. I totally agree with @hein (except the part about regular usage).

Why not just create a new submenu called "Manage"

No one will see what's inside. I don't discover what's inside of each submenu and I think so others.

Just wanted to point out that as proposed in a Desktop layout the context menu would contain only three items Lock screen, Leave and Configure Desktop.

-1 as well, removing entries is a no go, especially I won't accept the removal of anything related to widget manipulation