I want to make this program as useful as possible, so all suggestions are welcome!
As to engrave text... that is very specific. Maybe I can add a feature to create text geometry that can then be converted to g-code the usual way. But will have to add to the bottom of the wish list. Maybe a feature to engrave inside Gerber polygons in general would be useful. It already can engrave outside polygons, so inside wouldn't be a big deal. For now maybe you can save a separate Gerber file with your text and in FlatCAM create isolation with a NEGATIVE tool width. That will offset inwards and give you somewhat the result you are expecting.