That’s why I’m building this: [WIP] cheap DIY VR Control Box - 6 dual encoder / 8 button / 1 3-pos switch project
Not just the zoom. The entire GNS-530/430 is almost fully mappable, zoom works in all GPSs but G3X, radio tuning (COM/NAV), transponder, heading bug, course etc. work everywhere. Really great in VR. Just waiting for more encoders to come from China to complete the project, because now I’m switching banks with a 3-pos switch, and when there are full compliment of 6 dual encoders I won’t have to (mostly. The second bank will have rarely used functions, and third will be empty).