Dunno actually what happens if you put in a higher altitude in the MCP panel, SOP is to put in MDA and then use VNAV, 500' above MDA put in the missed approach altitude.
Best way however is not to use VNAV at all and just use the normal approach mode for non-ILS approaches, boeing made it available for a reason with VNAV just being the inferior backup mechanic.
Last edited by Denti; 17th May 2010 at 08:20.