The new TYPE codes |3 and |5 are equivalent to the existing TYPEs 3 and 5 (enable exitcode 3 for up arrow and 5 for down arrow) except that if used with a combo box, they also cause the up/down arrows to exit immediately (with the corresponding exitcode), rather than scroll among the choices in the combo box, PROVIDED THAT the combo box is not already in the dropdown position. (This is directly analogous to the XTREE coldef option ScrollMode=Tree.)
An additional side-effect of |3 and |5 (versus 3 and 5) is that SHIFT+UP and SHIFT+DOWN will now act as they do in text mode (i.e. get translated via the function key translation system), even if |K (Windows keyboard mode) is in effect.