I know they have never been part of the free version. What would be in it for Trimble you ask? Not much, I realize that, aside from my appreciation as I stated before.
The reason I made my request is that I have no intention to buy the Pro version, just for the solid tools. Yes, Pro is an appealling package... but just not for me. I am no more than an enthusiast amateur user, so Style Builder and Lay Out are more or less useless to me. I am only interested in the drawing features of SketchUp itself. And the Solid Tools definetely are some powerfull tools that could really safe some of my precious time while I am using SketchUp.
As I said, I have no intention whatsoever to pay a great deal of money just to unlock the solid tools. I have already tried the free third party plug-ins that are supposed to act like the solid tools, but they just don't seem to work.