voice message TTS about ascending/descending vertical speed (meters/second)

[ut]

Hi Orux,
with 9.7 beta 4 you introduce the new option to get voice messages based on the increment/decrement of altitude (settings-->TTS/voice).
It works perfectly! 

Now it could be nice to get another voice message about ascending/descending vertical speed (m/s).
It could be instantaneous or average (last x minutes or y meters ascended/descended)