Well if the stars align and Cowed does become open sourced (HAH!), here are a few suggestions.
A crafting system that doesn't make me want to kill myself. And is internally consistant. (Instead of a completely different method seemingly randomly assigned to each object, the Craft Verb combine X with X window has got to go.)
Once that is in place, we can work on expanding the various trees of craftsmithing, like blacksmithing, woodsmithing, clothsmithing foodsmithing and whatever else you can think of.
Changing coins to ingots would be a nice start.
Land-based boats, maybe.. Or like, carts. (Which will devolve into tank battles)
Metal walls and floors (see above)
And beards.
Cows with beards.
Like yaks, or something.
Addendum:
Damn it, I want depths, screw the whiny nay-sayers who hates new things, know who else hated new things? DINOSAURS! And they're dead for it! Give me crafting, glassworking, leatherworking, gem-smiths pearl divers, fishing nets, and ranged weapons for the win, slingshots, weak bows, composite bows, rare trees, magical glades! Haunted forests, cursed ancient battlefields! Ley-lines! Potions!
* Urist McBeefy has canceled post: too insane *
addendumdum:
Chickens, farming that works, simplified meat production, wild-life that respawns, bonesmithing! PLOWS! toolsmithing! siege engines! traps! Simulations of fire as they blaze through dry grass and wood buildings that are built too close together! Death to the shanty town slums! Fountains! Sewers! Water flows!
* Urist McBeefy has canceled post: too dead *
Aw, damn it. Cheap shot dude, cheap shot...