I use the add-poi-to-lines option only in a few cases (yet), and I don't use it 
on every node either, but only in the middle of a road segment 
(mkgmap:line2poitype=mid). 

One example is on lines tagged with route=ferry & opening_hours=* 
http://www.openstreetmap.org/browse/way/40326852

route=ferry & opening_hours=* & mkgmap:line2poitype=mid {name '${name} 
(${opening_hours})' | 'operating ${opening_hours}' } [0x6406 resolution 24] 

This is a screenshot of my map:
http://img836.imageshack.us/img836/5582/ferryroute.jpg

Before add-poi-to-lines was introduced I used an extra line to render 
opening_hours, but the disadvantage is that you often cannot see this info on 
the GPS (it displays the streetname only, or in this case where there is no 
streetname, it shows the bike route relation name). Other cases that you can 
use this are for example incline, smoothness, tracktype, access tags etc.


Greg wrote:
Can you explain when you want to have a POI for every node in a way?  It
seems the area->POI code makes one POI for the closed way, and this is
different.  (Not trying to be difficult; I really don't get it.)
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