That would be useful to handle 3D Solids together with VBA without Cell Library. I would like to suggest the following:
If a Cell Origin is defined / placed on the Active Model, the function Group (Ctrl + G) uses that crossed mark as Cell Origin otherwise use the default way.
Interesting workflow. It would be good to understand why or what you are trying to achieve.
Quickness? Yes, the current way of defining Cells is long winded and its aimed at supporting re-use. Ctrl-G currently creates orphan Cells which do not have names or an insertion point, so you can not use Replace Cell to manage them later. One addition to your suggestion would be to automatically name the Cell, presenting the proposed name to the user in a popup dialog?
Ctrl-G is often used to temporarily group elements for manipulation, locking etc. This is followed by Ctrl-U to unlock. This is typical as the user will typically need to manipulate something in the group as he is designing. There should be a way to save the Cell Origin and Name so that they do not have to be manually re-defined. One option is for Ctrl-U to automatically save this and when Ctrl-G is called offer this up automatically for the user to decide, manipulate if needed. If the Cell has Items etc attached, then this would also be saved for recall.
3D Solids: I dont think Ctrl-G works on Features or sub elements in the Feature Tree. It would be good to support groupings here. User would select the elements in the Properties Panel or on screen and hit Ctrl-G. The Cell Origin would be saved in the Solids Tree like an Array origin?