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In vi mode you can use Ctrl-V to enter visual block mode (or use the Edit > Selection Mode > Rectangle menu item), then Shift-I to enter insert mode (lower case i does not work, in order to follow to what vi does), then type what you want to enter, and finally press Esc twice to return to browse mode. Once you escape out of visual block mode then the typed text is replicated to the other lines. This matches how vi behaves, at least in my tests just now, and seems to match descriptions of this functionality in vim.