So, finally here is my attempt at utilizing TF for this as so far it has been pretty mechanical. Assuming that the vast majority of forging is done by NXT nodes with a full set of external plugins, then within a reasonable number of blocks, the plugin will get invoked. We can use TF to see how many blocks we need to wait for the first forged block that is on a node capable of executing the external plugin! This is SUPER useful, since otherwise we would need to try to invoke the plugin, wait for error and then retry. MUCH better if we minimized errors in the first place.