I've noticed that category searching on my Garmin Nuvi that it will not find Dunkin' Donuts when searching for Donut/Bagel in the USA. I ended up finding out that if an amenity is tagged amenity=fast_food the restaurant will automatically be placed in the fast food category and nothing else. The rub is that pretty much all donut/bagel shops necessarily are "fast food" because the food needs to be prepared well in advance, waiting a half hour or more for yeast to rise for fresh prepartion would be very inconvenient. According to https://wiki.openstreetmap.org/wiki/OSM_Map_On_Garmin/POI_Types it seems that perhaps only one category can be added per restaurant. In this case I wonder if it would be better to have categorization slightly different where fast_food would be a later conditional, so that (in the USA) Fazoli's (fast semicasual italian), Dunkin' Donuts, Einstein Bagels, Winchell's, Lamar's Donuts, Krispy Kreme Donuts, Pizza Hut (fast casual pizza), etc. should show up as their food category rather than simply as fast food. This is a bit tougher to manage with the automatic categorization with the template tags when editing in iD. I found a few independent donut shops and having a hard time deciding whether to mark them as fast_food as they definitely are, but they will subsequently not show up as a donut/bagel shop. Comments, or perhaps nobody really uses these things to find shops anymore...