JSFL single history output?

I'm working on a plugin that takes many steps to process, and I would like to only have it output a single history to the history array.

On previous versions using "fl.runScript();" allowed anything that would be placed into history to be combined into a single history step, both on the main timeline and inside a symbol's timeline.

When testing my tool on Animate CC 2019 however, if im inside a symbol this gets blown up to like the 10 seperate steps it's using. Additionally, because of the way CC needs to render before continuing, this makes the plugin almost un-usable on bigger timelines, where it would run perfectly on older versions of Flash.

Is there any way to bypass this history output? It works great on the main timeline, but symbol timelines are handicapping it.

Thanks.