I came to the forum to see if any Stardock products have this feature. Groupy or Tiles are best positioned to implement such a feature. For Groupy, maximizing the group could offer to present the group in a tab-less window with each application's coordinates saved. Then, if we can bookmark such a configuration, we can then launch it to restore the applications to our preferred positions and dimensions. Extra credit if the developers can save and restore specific documents within popular applications.
For Tiles, similar to dragging a window onto the bar to bookmark it, I would like to hold down Shift, Ctrl, or Alt key while dragging a window and have it group all visible windows, storing their window coordinates into a bookmark that would restore all.
In general it is okay to use the tabbed approach or the usual window approach that I can reposition on the fly. It's just not efficient and wastes time. I have daily and weekly activities that would be so much faster to transition into, complete, and transition out of if I could have this feature.