I think it is time someone seriously attempted valve actuation using small servos and the control input being by sensitive pressure switches which could be placed ANYWHERE in ANY ORIENTATION to suit the player...and with proper design the actuation COULD potentially be made faster than ANYBODY could manually depress a valve. The battery pack required could also power a wireless mic system.
I know, I know...not for many...but I am crazy and don't know enough to shut up.
Since I am from the (French) horn world, I have LONG thought about solenoid/servo valve actuation instead of the cumbersome paddles and linkages. Horns do not NEED to be lightning fast like trumpets, but with such a system the valve orientation could be optimized for acoustic performance and avoiding anti-nodes...while the actuating solenoids could be mounted anywhere convenient for the player..EVEN on the player's fingertips INSIDE THE BELL...so, if one had problems fingering left handed, one could set it up as they pleased.
ADDITIONALLY..and I know this is a ghastly thing to propose...but technically a difficult passage COULD BE PRE-PROGRAMMED so the trumpeter could focus on the LIPS and ignore (or extend his abilities beyond the limitations of his fingers). Since I am losing control of my right hand due to MS (I can BARELY move my right hand now) I could STILL enjoy playing otherwise impossible fingerings and therefore still enjoy playing as best I could.
..and I DON'T think it would be that hard to achieve such a system.
Heck...multiple fingers could be used...one could have six or seven or eight contact points that could allow more than one finger to actuate a valve...or one finger inputting THREE valves or TWO valves instead of requiring a finger per each valve...thereby potentially DOUBLING the fingering speed...This could make a very customizable format for the performer to use the advanced equipment to take the sport of playing to another level...sort of like the oversized heads on tennis rackets did to that sport.
Air actuation would also be possible, powered by replaceable CO2 canisters.
Yes, I know DeLoreans REALLY didn't transit the space-time continuum...unless John Z. was still heavy in his coke habit.