I typically use a pair of ST interfaces to move "conduit like" data around. When the data requires flow control then I *highly* recommend using ST interfaces since conduits are literally a "free-for-all clump of wires and buses" with no concept of flow control unless you implement it yourself. The bare minimum for an ST interface is the 'data' signal so if you want to move signals from point A to B you can just bury them in the data signal.
As for all this Qsys talk... I would wait until there is a formal release so that you will have documentation to follow along with.