one thing i miss in live, that is available in reason (it was when i last worked with it), was the fact that synced lfo-s always played in the same phase in a track. that way predictable results cold be achieved and you could make nice rhythmical patterns with it.
i'd like to have that in live, or maybe just a simple LFO-retrigger button on devices that use some kind of LFO (flanger, simpler, etc)
(obviously, it's not the same as key retrigger we have today)