Given we have the equivalent of Melodyne inside Reason now, the next step is the equivalent of VocAlign:
This is already possible manually by shifting stuff or by using hard quantize values with the inline ReCycle on Audio Tracks, but what we really need is a macro or time alignment based on other tracks.
Whilst implementing this, it would also make sense for Props to allow ReGroove to be applied to audio too; even if its just an offline apply (I imagine realtime might be tricky).