VNAV/LNAV approaches on boeings were obviously designed to be flown using automatics although flight director usage is sufficient. The IAN thingy has the same presentation to the pilot flying any non precision approaches as any precision approach (GLS or ILS for us) and therefore can be easily used flying "raw data", following the flight director or fully autocoupled. If you forget to disconnect the pilot because you think its just an ILS and you do an autoland you will get a warning at 100' with a yellow AUTOPILOT on the PFD and auto-callout "AUTOPILOT". If you set up the system correctly (select the approach from the database, fill in the descend forecast page and press APP when cleared for it) it is a very nice and stable way to fly non precision approaches, besides it nearly removes the difference in SOPs and presentation between precision and non precision approaches.
Of course that could be seen as catering to reduced training and only the low hour pilots, however i do think it is a perfect way to make flying safer and reducing the risk of mishaps and CFITs.
IAN is standard for 737s since 2006, dunno if it is available yet on other boeing types allthough we do know it will be available on the 787 (and boeing promises that you can do operate 737 and 787 in MFF, but thats another thing).