Smile Requesting the option to add a volume navigation button

I've been using the CMs for the first gen kindle fire lately. On the 1022 SGT7 editions, I noticed there was the option to add a volume button in the navigation button bar.

the link to the sgt7 rom is

But on all of the later editions, that option was gone.

While for other devices, a virtual button for volume level isn't that meaningful, but for the first gen kindle fire, this function is very convenient, since this device doesn't have any physical buttons for sound.

I cannot post in the development section yet, so can someone look into this or possibly post this question under the rom thread?