The indicator is easy to code, so it can be added to charting packages with basic scripting. Stratasearch code for 3-day EMA of daily V * PMO follows as an example:
Thanks much for your response. I haven't chosen a charting package yet. Mostly relying on online charting services such as Stockcharts and Bigcharts. I'll check into Stratasearch and see if it fits my needs. Thanks again for the help.