This is not what I'm saying.
First, to do CIH without an anamorphic lens with a scaler, we don't need vertical stretch (and I don't think the EDGE can do V-strech), we just need zoom, pan and memory for these.
On the VP50Pro, there is a way to do it simply by saying the output ratio of the display (16/9 for example) and the output ratio of the screen (2.35:1 for example). This capability is missing on the EDGE.
An other way to do that is to "play" with zoom and pan. VP50Pro has these functionalities, but not with a range allowing us to do CIH setup without an anamorphic lens since zoom minimum is 100% and we need about 80% to reduce the 16/9 image in order to stay in the 2.35:1 screen.
Such negative zoom (zoom < 100%) is called Underscan and exists only on VPxx products and is only referenced in the VP30, VP50 and VP50Pro (according user manuals).