Add world building classes, with ability to modify the world either inside of plots, or outside it (if possible).
Examples:
Road Building - who wouldn't like to add that road bonus where you really want it? This one could be dragon as well as bi-ped class. Different tiers could be different speed bonuses. Existing roads maybe t3 or 4.
Plant Farms - plant your own potato patch, pepper plants, etc. This one might work for plots. Could have community veggie patches. Maybe also could stock fish.
Plant Trees - Similar to farms - plant the tree forests of your dreams.
Dig Mines - Gives a use for prospecting skill - i.e. where to dig, then dig the hole. No prospecting skill and you are just digging holes that cave in. This one could be dragon as well as bi-ped class - dragons might get bonuses.
Landforming - elite crafting class requiring some number of other world building classes to a minimum level - raise land, lower land, drain swamps, build ponds, flood lands to make swamps, etc.