option for a node to be a 3x3 grid
Not all ideas have a hierarchical structure. Some ideas consist of two or more dimensions that combine together, and neither can be considered the parent of the other. I would like to put these kinds of ideas inside my hiearchically structured mind map.
Maybe this could be an "extension" and have its menu or buttons up the top? So if I select a node, then I can click the button to turn that node into a 3x3 grid, and then I can enter text into any of the nine sections in the node. If I only want a 2x2 grid, I can leave one row and one column blank. If I only want a 1x3 grid, I can leave two rows blank. The app would display it nicely as 2x2 or 1x3 etc, according to which rows or columns have been left blank. If you want a greater than 3x3 grid, then instead of using this feature, you would link to e.g. a sheets file.
This would greatly expand the capacity for mind mup to express ideas, without deviating from the mind map paradigm. The alternative idea structure would only be at node level. Should we want to draw up an idea that is purely dimensional and not hiearchical, then we would use a different app, e.g. sheets or doc tables.