rooExtend v3.4.3 is out
Release 3.4.3 introduces a new feature for rooMax
and should be install unattended during the next night 
Based on a suggestion from a rooMax user, I implemented a new selection mechanism for the zones.
The new function is part of the transport function set and is called “Select Zone” (see below).
If you customize one of the buttons with this function (I labeled it “Zone”) you can use it. It works as follows:
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Pressing the button the color of the LED ring changes to blue and the current zone name shows up blinking in the middle of the display (1s rhythm).
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Rotating the wheel you can browse through the available zones. The update of the zones in the display is a bit slow as the Quick Keys controller limits the output speed to one zone name per second.
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When you press the button in the middle of the wheel, Quick Keys will be assigned to the displayed zone. So you then control the selected zone.
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If you press and hold the button in the middle of the wheel, the playback active in the current zone will be transferred to the selected zone. This zone will then also be controlled by quick keys.
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if you press any other key while the LED-ring is blue the operation is canceled and you will return to the setting you saw before.
I hope this new feature makes life a little easier for users with many zones 
Best DrCWO
EDIT:
This update is available for Raspberry Pi users ONLY at the moment.
The update for users of the rooExtend-Box it will be released end of September.