Is your feature request related to a problem? Please describe.
I've been playing a lot with controller, touch controls AND keyboard, and there is something that bores me:
The behavior of sneaking and sprinting actions aren't the same!
So I suggest more options for the accessibility of those things.

Describe the solution you'd like
For sneaking:

• Hold (same behavior than the curent "Hold" option)
• Ground (same behavior than sneaking for controller and touch in bedrock, toggle on ground and mid-air and hold in water and flying)
• Toggle (same behavior than the curent "Toggle" option)

For sprinting:

• Hold (making it actually hold)
• Momentum (same behavior than the curent "Hold" option)
• Moving Toggle (same behavior than the sprint button in the new Bedrock touch controls, a toggle then set to off if we stop moving)
• Toggle (same behavior than the curent "Toggle" option)

It could also been applied to the keyboard through Minecraft Accessibility settings