There's no native command to read a specific/random line from all sections of an ini.

Anyway, here's a quick scribble:
Code:
; $readallini(<file>,[line])
; [line] can  be:
; - a positive integer to return data of that line counting top-bottom
; - a negative integer to return data of that line counting bottom-top
; - 0 to return the total number of lines
; - nothing to return data of a random line

alias readallini {
  ; any lines in <file>
  if ($lines($1)) {
    ; filter to a tempfile, exclude lines starting with "[" and blank lines
    filter -ffcxg $qt($1) readallini.tmp ^\[|^$
    ; any lines remaining
    if ($filtered) {
      ; second parameter is 0: return total
      if ($2 == 0) { return $filtered }
      ; no or invalid second parameter: return random
      elseif ($2 !isnum) { return $gettok($read(readallini.tmp,n),2-,61) }
      ; second parameter is a positive number: return that line 
      elseif ($2 > 0) { return $gettok($read(readallini.tmp,n,$v1),2-,61) }
      ; second parameter is a negativenumber: return that-last line
      elseif ($calc($filtered + $2 +1) > 0) { return $gettok($read(readallini.tmp,n,$v1),2-,61) }
    }
  }
}