Help System (web edition)

Insert mode:
Parameter `insert_type' determines the function of the
INSERT key in text editing. Value 1 implies that INSERT merely
selects/deselects the insert mode. Value 0 implies that each INSERT
stroke adds one space at the current cursor position.
    When typing text between existing lines, an automatic line insertion
mode is adopted (i.e. a new line is inserted when the current becomes
full) when parameter `insert_lines' is 1. If it is 0, lines are not
inserted automatically. This setting can also be adjusted during the Survo
session. To toggle the insert line mode on, press PREFIX A . To put it
off, press PREFIX a .