@Morphoice I reckon hasTail is for the case where DAWs cut the plugin processing between the clips to save CPU on big projects. hastTail allows your plugin to still read the buffers until a minimum threshold has been reached before effectively cutting the sound (i.e. for reverbs, etc...)
If your node is optimised, you shouldn't need to bypass it. If the heavy processing is done then you can just do nothing in the process callback to save CPU using just one branching (if statement)
I don't know how your system is built, but if your sound is triggered with MIDI you can use midi events in C++ node with handleHiseEvent, but if it's just reacting to audio then...