Thx Debbie. I saw Script Runner as an option based on at least one similar question raised. I tried running it and realized it was going to try to run the ENTIRE script I had open as opposed to just some selected SQL I had highlighted in the window. The attempt to run the whole thing is a problem only because my scripts have pre-amble SQL that is for scratch work and then later on the real / cleaner script begins. (And I'm not the only person who works this way!) But it might be an option if it can solve both those issues with no other snags.
I wish there was a way to "SCRIPT RUN" just a selected code block, maybe using a background / temp / invisible / disposable code file that I don't even know exists. I can imagine right clicking on a selected code block and there's a "Send this Block to Script Runner" option or something.