There have been talked about upgrades for tc but not really any for forge. Or maybe only the steel arrows.
Have thought of taking combining battle items with craft mats or item with item.
The Steel arrows: arrows + steel bar
A flaming axe: normal axe + dragon atk. Maybe 5% or 10% more debuff + plus burn.
Better banner: tutle + dragon and bear + dragon.
And maybe a new item for the unused craft mats. (Like common herbs)