Oh yeah, tell me about it, I went nuts creating like 60 new lines in the weapon.iff for the NGE effect mod.
Same with column adding, it totally feel ya.
What worked for me though, was right clicking and copying/pasting, keyboard commands never seemed to work for me.
I talked to Uli, but I don't think there is a v2.0 anywhere, the only thing was what I linked, where Uli made it faster essentially.
But I'm in the process of making mod tools at the moment, I might give a shot at the datatable.iff files, but I don't know yet, strapped of time as it is. I know Sytner has a fantastic .iff edtior, not sure if has a datatable editor though.