Pitch trim on the 10 is very powerful, and used all of the time. Every speed and load change requires trim as well as flap deploy.
Last week I ran the trim all the way back (full up) at idle to see what speed would result. It gave 65 knots. To get 85 knots I had to come back almost 80% towards neutral. If I remember correctly, the tab movement geometry (correct me if I am wrong) moves both tabs for up and only one tab for down. Any manual over ride to the system as set up would likely move both tabs together both ways.
I can see two ways to get electric/manual trim; One is to replace the entire Vans system with a cable into the center console with a stepper motor/wheel combination. The other would be to modify the trim motor to manually slide fore/aft with a manual cable, there by moving the tabs.
My electric rudder trim, I use all of the time to center the ball. A combination of loading, power (climb/cruise) and the nose wheel pant position all seem to contribute to minor trimming on almost every flight. What I installed is not powerful and could be easily overcome or just 'lived with' if disabled. I see no reason to install a manual over ride. See this link for my solution;
One thing I wish I had done is to add the Yaw Damper servo to the Garmin auto pilot. I find the 10 wags it's tail in bumpy air. I have never had any front or rear seat passengers complain, but I notice it. A little less wagging in bumps would be worth the incremental cost in my view.
Aileron trim is used almost not at all in my flying to date. A little to balance the load, but rarely. I switch tanks to balance fuel load more often to balance the roll tendency than trim. It is a servo/spring system connected to the push rod in the wing. I have never tried to run the trim all the way to the stops to see how powerful the effect is, so not sure what a run away might be like. I suspect, like the pitch trim, the aileron trim servo could be mounted on a manual slider to provide over ride control. The servo is in the wing (either side depending on builder preference) so a cable routing might be a bit of fun.
As mentioned before the Vertical Power and the Garmin system will disable the trim motors power after, I believe, 2 seconds of constant run time to minimize a run away event. Even that would be a hand full on pitch. Both systems also have speed sensitive trim scheduling. Garmin has programable continuous scheduling while Vertical Power is a single speed/step function. In my view, the Garmin system is smoother to fly with
Good luck. Hope this helps.