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It would be nice if Hex Kit tracked which sets of tiles I'd used during a session and put them into a separate, alphabetically arranged, tile set, that would be selectable like other tile sets.
For example, if I've picked tiles out of HK-Dangerous Scenery/O To Be At Sea/Angry Sea, then the O To Be At Sea directory would be listed in my recently used list. If I start picking tiles from HK-Fantasyland/HK - Arctic and HK-Fantasyland/HK - Ice Flow, then the Arctic and Ice Flow directories would also be listed.
This isn't something that would have to persist between sessions, but would be handy when, for example, I'm creating a shoreline and constantly going between Fantasyland's Arctic and Dangerous Scenery's Seaside Cliffs sets.