Size choice option on web@plako's advanced editor.

On the file editores.php there is a list of buttons:

$editor500->botoes[40] = 0; (Font type)
$editor500->botoes[41] = 0; (Size)
$editor500->botoes[20] = 0; (Text colour)

Usually these are always 0 (they're not visible). In order for them to appear on the advanced editor, the value must be 1.