You can click any feature on the map (i.e. village, town, settlement, danger, mountain, swamp, desert, forest) to see its name on a "sticker", but currently only settlements have real descriptions. It is possible to display more than one sticker by "shift-clicking" features (vs regular clicking) - this works in the same way as file selection in File Explorer or Finder. Also you can "ctrl+click" any feature to display stickers for all the features of the almanac. All the stickers get exported along with the rest of the map both in PNG and SVG.
I'm not sure I get your questions about coastal towns. Any settlement on a hex which borders the water is considered a coastal settlement: click it and you'll see "A seaside town known for..." or something like that. On the settlement map (in MFCG and VG) there will a coast and probably some piers.
I am planning to implement maps of arbitrary size in the future (with some reasonable limitations in place), although for me personally the main reason to do it is to be able to generate non-square maps. I tried to build larger maps (i.e. consisting of a large numbers of hexes) and it doesn't look very good - mountain ranges, rivers and some other features look wrong.