Doesn't Bobs mods already have some sort of sapling type thing? If so, wouldnt you just use the Bobs mods ones?
I guess it might be useful to have both placable and automatically farmable saplings (probably what you mean now I think about it), so I guess it wouldnt be too hard to make it default to one of the two mods items...
I might do it some time I guess, ill look into it