Feature Request: Pause or Confirm Node (Supports Seed Cherry-Picking)

Would like to have a node type that is basically a "Pause", or "Confirm [Yes/No]" before continuing. It could work similarly to the Reroute node, accepting any input/output.

When that node is executed, pause and let the user either continue or stop/cancel the run.

The workflow I'm trying to create that I'm having trouble doing is:

* Random seed for each run
* Run txt2img
* Pause here, wait for human input. Look at preview to determine if it's a good seed
* If it's a good seed, run latent upscaling (or something else that is more time-consuming)
* If it's not a good seed, stop the job (i.e. start the next job in the queue to evaluate another random seed)

Is this possible today, if not, what would the best way be to implement something like this?