It’s a feature, but an incomplete one. Eventually, every sustain point will have its own on/off state that can be set at any time and controlled by parameters as well as through code, allowing you to disable sustain points and re-enable them in order to produce a variety of complex behaviors. Unfortunately, we haven’t yet set up the interface for controlling this, so all you can do is turn them off permanently from left to right. Obviously, this isn’t an ideal situation, so for now we suggest you use loop regions with trigger logic instead.
It is working, so far as I can tell. What behavior are you seeing?
We’ve planned for a while that it should be possible to set the values of a parameter in the same event, but that feature’s still a ways into the future (there’s a lot of kinks we need to work out). For now, you might be able to achieve the effect you want by controlling the values of parameters of nested and referenced events from their parent events.