Monaco updates; Remote Preview and Flowcharts improvements; New example & bug fixes.
No, it's not possible, at least not right now.
That is something that can be handled through event sheet logic though, when the flow lands on a given node you can process it and decide if an output is available or not. If it's not, it effectively is like disabling the node that is linked to it at runtime.
The feature is similar to commenting lines of code, a quick way to turn something on/off without outright deleting or disconnecting it.