In their current form, Auto-Indexing tunnels only operate on a single dimension of an array. For example. If you input a 2D array, through an auto indexing tunnel into a for loop, and display the resulting 1D array in an indicator inside the for loop as below, you will always get the last row.
I'd like to see a feature where you can right-click on the tunnel or something, and set it to auto-index by column, instead of by row, and get the last column instead.
It could be as simple as an option in the context menu for the auto-indexing tunnel to say "Index by rows" or "Index by columns" It gets more complex with 3D 4D and moreD arrays, but you could do something like a submenu flyout that says "Index By Dimension" > "1", "2", "3" etc