Figured out what I meant the other day when I posted #792
Visual block! not regular visual.
In vim if you select a block and then press c and type some text, the new text appears on each line, replacing the block's contents.
In vsvim right now the typed text is only inserted on the first line of that block.
Ok. I see what you're saying now.
We do have a bug tracking this limitation. It's #244. It's on my list of "must have" for the 1.3 release.