Wow, it's so amazed to find somebody using "sequence" node so well.
There's a "repeat" option in the sequence node. When turned off, the sequence will only run once until the input switch from false to true a second time.
We wished to stuff more outputs in the sequence node, but it turns out to be really ugly - eg. the sequence node might get deleted when simply dragged. So the limit is 6, at least for now. But Makeblock is still finding a better way to increase the possibility of this node.