there are add-in for that DF1-TFD and you can add in new MP/SP mission from the other games into it.
you can get many tools to use from here and from
www.novasheep.com for that. i said before there so much you can do with DF: LW think it has a lot of tools you can use more then the others.
as for new items: think it this way add-in Trains, tree's, buildens, tanks and more from DF2 to DFLW
www.novasheep.com has it.