Question about modding tile improvements

[brandon1965]

Apologies if this has been asked before but I didn't see a thread on this topic. Would it be possible for someone who understands modding to mod the xml for tile improvements so they can produce gold, science, culture, and espionage points directly rather than only producing commerce/food/hammers? I would like to be able to mod forest preserves to add 1 or 2 culture, windmills to produce direct science, villages and towns to produce a small amount of gold directly, and forts to generate espionage points thus making forts somewhat more useful. I'm hoping this can be done with just the xml and would appreciate any help anyone can offer.

[Afforess]

Tile improvements can not give commerce without SDK changes.