What do you mean by this ?
In the standard, we already do have
- "high resolution CC": optionally additionally send a message with CC # + 32 for lower 7 bis of the value to get a resolution of 14 bits
- "high resolution velocity": optionally additionally send a message with CC # 88 for lower 7 bis of the value to get a resolution of 14 bits
- Midi MPE (allowing for dynamically controlling multiple pressed notes separately)
High resolution CC and MPE wold be very appropriate for (multiple-)solo string, woodwind and brass instruments. I decently miss both of these with my Breath controller and my Seaboard.
On top of this, Midi 2.0 (released in January 2019) introduces the possibility of doing CC - alike messages with a resolution of 32 bits (with a much increased volume of data).
But I feel that 14 bit is good enough in close to all cases.