Sneak Toggle in Fly-Mode for Mobile Players

This feature is for MCPE / Mobile Minecraft Players. 

I was playing in Creative Mode building a house. I was in fly-mode and when I tried to place an Oak Trapdoor on top of a Barrel, it just opened the Barrel Screen (I know that).

I had to press both Down & Up buttons at the same time to Sneak while flying to place the Trapdoor on top of the Barrel (Functional Block).

It is kinda frustrating because everytime, I had to press both the Up & Down buttons to place something on a functional block like Barrel, Anvil, etc…

It would be useful if there was a Sneak Toggle or a Sneak Button that appears when in fly-mode. So it'll be easier to place blocks on top of another, especially Functional Blocks. 

On Keyboard devices like Computers or Laptops it is easier to place blocks by pressing the Shift button.

Hope this feature will be added SOON…