General suggestion: Would it be possible to add some fake "plants" to gather along coastlines? Like bits of coral and seashells that seem to wash up on the shores of ocean biomes, that could then be gathered and processed (but not farmed) into usable materials for crafts? I think it would make coastal forts a little less boring.
If so, I've thought of a list of such "plants":
Conch: rare, provides a single shell
Sand Dollar: common, very fragile, provides 0-1 shells
Bivalve: rare, provides 1-2 shells
Oyster: rare, provides a small amount of oyster meat and 0-1 highly-valued "pearl" rough gems
Urchin: common, provides a small amount of urchin meat, possibly a source of shell and/or pain-poison
Jellyfish: common, provides a small amount of jellyfish meat, possibly a source of pain+paralysis-poison
Kelp: very common, provides a moderate amount of leaves for cooking, possibly have a reaction that makes it into rope similar to intestines
Large Driftwood: very common, provides a low-valued log
Coral: rare, provides 1-2 high-value rough gems
Shark Tooth: rare, provides a tooth for ivory crafts/decoration
It isn't dwarf-specific, but I wasn't sure where to put this, since to my knowledge, there isn't a "general suggestions" thread.