The following functions may be used in custom keymaps:

edit
suspend
toggle_lock
next_file
toggle_options
extended_key
toggle_case
delete_file
bob
delete_window
digit_arg
down
edt_backward
edt_find
edt_find_next
edt_forward
edt_line
edt_page
eob
exit
find_file
find_next
goto_line
goto_mark
goto_percent
help
one_window
other_window
page_down
page_left
page_right
column_right
column_left
page_up
redraw
search_backward
search_forward
set_mark
show_time
tail_mode
toggle_width
two_windows
up