This type of Moving Average has been included in many of the "Averages" versions of the indicators by Mrtools & Mladen but for those who want the standalone version I'll post it here

This is the eVWMA (Elastic Volume Weighted Moving Average) which was kindly coded by Mladen for MT4. Mladen also included (newer drop down box) Multi-timeframe + Interpolation.

In short, the Elastic Volume Weighted Moving Average is a trend indicator that uses average volume in its moving average calculation.