ssrs sharepoint integrated mode: where's recursive parameter?

could someone tell me since ssrs web use reportservice2005.asmx recursive parameter listchildren while sharepoint integrated mode chronicle reportservice2006.asmx does not?

reportservice2005:

public catalogitem[] listchildren (
    twine item,
    bool recursive
)

ref:

reportservice2006:

public catalogitem[] listchildren (
    twine item
)

ref:

if i wish listchildren sharepoint integrated mode, i assume i have recurse myself?

reasoning behind dismissal parameter?

google arrangement nothing...