Can a sequence of nodes be run in SMACH, behavior trees, or similar?

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Hi,

I am looking for a solution to the idea of creating a state machine as a sequence of nodes, or a sequence of concurrent nodes. Where the nodes, could be nodes of any type that a user has created.

SMACH/pi-trees/flexbe, out-of-the box seems to work with actionlib, services, topic monitoring. But what if you want to take an FSM and do as follows:

state1 (node1) -> state 2(node 2) -> state3(node3), while checking some kind of transition checking.

Or perhaps running nodes concurrently: state1 (node1,node2) -> state 2(node3, node4) -> state3(node5), this would also be similar to having each state call a launch file....

Thanks